Elan Microelectronics Corporation v. Apple, Inc.

Filing 371

Declaration of Derek C. Walter in Support of 369 Opposition/Response to Motion to Compel Discovery Related to Apple iOS Applications for the Accused Products filed byApple, Inc.. (Attachments: # 1 Exhibit A, # 2 Exhibit B, # 3 Exhibit C, # 4 Exhibit D, # 5 Exhibit E, # 6 Exhibit F, # 7 Exhibit G, # 8 Exhibit H, # 9 Exhibit I)(Related document(s) 369 ) (Walter, Derek) (Filed on 8/2/2011)

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Angry Birds
From Wikipedia, the free encyclopedia

Angry Birds is a puzzle video game developed by Finland-based
Rovio Mobile. Inspired primarily by a sketch of stylized wingless
birds, the game was first released for Apple's iOS in December
2009.[2] Since that time, over 12 million copies of the game have
been purchased from Apple's App Store,[3] which has prompted the
company to design versions for other touchscreen-based
smartphones, such as those using the Android operating system,
among others.

Angry Birds

In the game, players use a slingshot to launch birds at pigs stationed
on or within various structures, with the intent of destroying all the
pigs on the playfield. As players advance through the game, new
birds appear, some with special abilities that can be activated by the
player. Rovio Mobile has supported Angry Birds with numerous free
updates that add additional game content, and the company has even
released stand-alone holiday and promotional versions of the game.

Title card for Angry Birds

Angry Birds has been praised for its successful combination of
addictive gameplay, comical style, and low price. Its popularity led
to versions of Angry Birds being created for personal computers and
gaming consoles, a market for merchandise featuring its characters
and even long-term plans for a feature film or television series. With
a combined 300 million downloads across all platforms and including
both regular and special editions,[4] the game has been called "one
of the most mainstream games out right now",[5] "one of the great
runaway hits of 2010",[6] and "the largest mobile app success the
world has seen so far".[7]

Contents
1 Gameplay
2 Development
3 Release
4 Reception
4.1 Awards
5 Ports
6 Special editions
6.1 Angry Birds Seasons
6.2 Angry Birds Rio
6.3 Angry Birds Magic
7 Other media
8 References

Developer(s)

Rovio Mobile

Publisher(s)

Chillingo/Clickgamer
(iOS, PSP/PlayStation 3)
Rovio Mobile (Maemo,
Symbian^3, Android)

Producer(s)

Raine Mäki, Harro
Grönberg, Mikko
Häkkinen

Designer(s)

Jaakko Iisalo (lead
designer)

Programmer(s) Tuomo Lehtinen (lead
programmer), Miika
Virtanen, Antti Laitinen,
Atte Järvinen, Mika
Rahko, Marco Rapino,
Kari Kuvaja
Artist(s)

Tuomas Erikoinen (lead
artist), Miisa Lopperi,
Joonas Mäkilä

Composer(s)

Ari Pulkkinen

Engine

Box2D

Version

1.6.2 (iOS, Android)
1.6.0[1] (Symbian)
1.5.3 (Windows Phone)
1.5.2 (Maemo, Mac OS
X, Microsoft Windows)
1.5.0 (PlayStation
Portable, PlayStation 3)

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9 External links

1.1.3 (WebGL)
Platform(s)

Gameplay

iOS, Maemo, Palm
webOS, Android,
Symbian^3,
PSP/PlayStation 3, Mac
OS X, Windows,
WebGL, Windows Phone
7

In Angry Birds, players take
control of a flock of multicolored birds that are
attempting to retrieve eggs
that have been stolen by a
Release date(s) December 10, 2009[2]
[8]
group of evil green pigs.
Genre(s)
Puzzle
On each level, the pigs are
sheltered by structures made
Mode(s)
Single player
of various materials such as
A yellow bird collapses a structure
Rating(s)
ESRB: E
wood, ice[9] and stone, and
onto several pigs.
Apple: 4+
the objective of the game is
PEGI: 7
to eliminate all the pigs in the
level. Using a slingshot, players launch the birds with the intent of
either hitting the pigs directly or damaging the structures, which would cause them to collapse and kill the
pigs.[10] In various stages of the game, additional objects such as explosive crates and rocks are found in the
levels, and may be used in conjunction with the birds to destroy hard-to-reach pigs.

There are several different types of birds used in the game. In the earliest levels, the basic red bird is the only
one available.[8] As the player advances through the game, additional types of birds become available; some of
these birds are more effective against particular materials or they have special abilities that are activated by the
player after the bird has been launched.[10] For example, a blue bird can separate into three birds,[8] a black bird
explodes[10], and a white bird can drop explosive eggs.[8] The pigs themselves also appear in different sizes.
While small pigs are relatively weak and are easily destroyed either by direct hits or by debris from the damaged
structures, larger pigs are able to sustain more damage. Also, some pigs wear helmets as armor, making them
more resistant to damage, while pigs with crowns can take the most damage.
Each level starts with the number, types, and order of birds pre-determined.[8][10] If all of the pigs are defeated
by the time the last bird is used, the level is completed and the next level is unlocked.[8] Points are scored for
each pig defeated as well as for damage to, or destruction of, structures, and bonus points are awarded for any
unused birds. Upon completing each level, players receive one, two, or three stars, depending on the score
received. Players may re-attempt unlocked levels as many times as they wish in order to complete them
successfully or to earn additional points and/or stars.

Development
In early 2009, Rovio staff began reviewing proposals for potential games. One
such proposal came from senior game designer Jaakko Iisalo[12] in the form of
a simulated screenshot featuring some angry-looking birds with no visible legs
or wings.[13] While the picture gave no clue as to what type of game was being
played, the staff liked the characters,[13] and the team elected to design a game
around them.[11] As the concept of Angry Birds was developed, the staff

Prior to this meeting we had set
up strict criteria to determine
which game we would go with,
but we threw that out for the
angry bird character.
–Mikael Hed, CEO of Rovio

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Mobile
realized the birds needed an enemy.[12] At the time, the "swine flu" epidemic
was in the news, so the staff made the birds' enemies pigs.[12] The game's
mechanics were inspired by other petrary physics games that have been released over the years, including
another 2009 release, Crush the Castle.[14][15] The initial cost to develop Angry Birds was estimated to exceed
100,000 Euros, not including money spent on the subsequent updates.[13] For the Apple iOS version, Rovio
partnered with distributor Chillingo to publish the game to the Apple App Store.[16] Since then, however, Rovio
has self-published almost all of the later ports of the game, with the exception of the PlayStation Portable
version, which was produced under license by Abstraction Games and then distributed by Chillingo.[17]
[11]

When Rovio began writing new versions of the game for other devices, new issues came to light. As the team
began working on a version for Android systems, they observed the large number of configurations of device
types and versions of the Android software.[12] The number of combinations of software version, processor
speed and even user interfaces was significantly larger than that for the earlier Apple iOS version.[18]
Ultimately, the team settled on a minimum set of requirements,[12] although that left nearly 30 types of Android
phones unable to run the game, including some newly released phones like the Motorola Backflip.[18] One
month after the initial release on Android, Rovio Mobile began designing a simpler version of the game for these
other devices.[18]
In early 2010, Rovio began developing a variant of Angry Birds for Facebook.[19] The project became one of
the company's largest, with development taking over a year.[19] The company understood the challenges of
transplanting a game concept between social platforms and mobile/gaming systems. In a March 2011 interview,
Rovio's Peter Vesterbacka said, "you can’t take an experience that works in one environment and one
ecosystem and force-feed it onto another. It's like Zynga. They can’t just take FarmVille and throw it on mobile
and see what sticks. The titles that have been successful for them on mobile are the ones they’ve built from the
ground up for the platform.”[19] The Facebook version is expected to incorporate social-gaming concepts and
in-game purchases and was scheduled to enter beta-testing in April 2011.[19]
Future improvements planned for the game include the ability to synchronize the player's progress across
multiple devices; for example, a player who completes a level on an iOS device could log into their copy of the
game on an Android device and see the same statistics and level of progress.[20]

Release
The initial iOS version of the game included a single episode entitled "Poached Eggs", which contained three
themed chapters, each with 21 levels. From time to time, Rovio has released free upgrades that include
additional content, such as new levels, new in-game objects and even new birds. As updates have been released,
they have been incorporated into the game's full version offered for download from each platform's application
store.[21]
The first update, released in February 2010, added a new episode called "Mighty Hoax", containing two new
chapters with 21 levels each. Updates released in April 2010 added the "Golden Eggs" feature, which placed
hidden golden eggs throughout the game that would unlock bonus content when found, and a new episode called
"Danger Above", which initially contained a single chapter of 15 levels. Two later updates added two more
chapters to "Danger Above", each with 15 levels. "The Big Setup" episode, released in June 2010, added a new
chapter with 15 levels and additional Golden Egg levels.[22] "The Big Setup" was later given two more chapters
of 15 levels each.

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A fifth episode, called "Ham 'Em High", launched in December 2010, in celebration of the game's first year in
the iOS App Store.[21][23] "Ham 'Em High" contained 15 Wild West-themed levels in a single chapter,[24] with
updates in February 2011 and March 2011 each adding one new 15-level chapter.[25][26] "Ham 'Em High" also
introduced the Mighty Eagle, a new bird that may be used once per hour to clear any uncompleted levels.[24]
The Mighty Eagle can also be used in previously completed levels, without the once-per-hour limit, to play a
mini-game called "Total Destruction" in which the player attempts to destroy as much of the scenery as possible,
both with the standard birds and the Mighty Eagle; achieving 100% destruction earns the player a Mighty Eagle
feather for the level.[24]
The Mighty Eagle is offered as a one-time, in-game purchase,[21] and is currently available only for iOS, as its
App Store customers have iTunes accounts with pre-linked credit cards.[27] Rovio has begun testing an Android
update called the "Bad Piggy Bank" with the Elisa wireless service in Finland, which allows users to charge
in-app purchases, such as the Mighty Eagle, to their mobile phone bills; the service is expected to become
available to other Android users in the second quarter of 2011.[27]
The sixth episode, "Mine and Dine", was released on June 16, 2011 with 15 new mining-themed levels and a
new Golden Egg.[28]

Reception
Reviews of Angry Birds have been generally positive. Chris
Holt of Macworld called the game "an addictive, clever, and
challenging puzzler",[8] and Pocket Gamer's Keith Andrew said
Angry Birds is "a nugget of puzzling purity dished out with
relish aplenty".[10] Jonathan Liu of Wired News wrote that
"going for the maximum number of stars certainly adds a lot of
replay value to a fairly extensive game".[35]

Reception
Aggregate scores
Aggregator

Score

Metacritic

iOS: 80% (based on 13
reviews)[29]
PSP: 77% (based on 13
reviews)[30]

Reviews for the first versions of the game to not use a touch
Review scores
interface, the PlayStation 3/PSP version and the Windows
Publication
Score
version, have also been positive, but with some disagreement
over the different interfaces. Will Greenwald of PC Magazine,
GameZone
iOS: 8.0/10[31]
in his review of the PlayStation Network version, said that the
IGN
iOS: 8.0/10[2]
control scheme on these platforms is good, "but they're not
PSP: 7.5/10[32]
nearly as satisfying as the touch-screen controls found on
Android: 8.0/10[33]
smartphone versions", and that the PlayStation 3 version
appeared "blocky and unpleasant, like a smartphone screen
Official PlayStation
PSP: 90/100[30][34]
Magazine (UK)
blown up to HDTV size".[36] Conversely, Greg Miller of IGN
[8]
preferred the analog control setup of the PSP version, saying it
MacWorld
iOS:
"offered me tiny variances in control that I don't feel like I get
Pocket Gamer
iOS: 8.0/10[10]
with my fat finger on a screen".[32] While giving the game a
positive review, Miller concluded, "There's no denying that
Angry Birds is fun, but it could use polish – such as sharper visuals, a better price and smoother action."[32]
Damien McFerrin of British website Electric Pig reviewed the PC version, saying "the mouse-driven control
method showcases many distinct advantages over its finger-focused counterpart".[37]
Angry Birds became the top-selling paid application on Apple's UK App Store in February 2010, and reached

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the top spot on the US App Store a few weeks later,[38] where it remained until October 2010.[39] Since release,
the free, limited version of Angry Birds has been downloaded more than 11 million times for Apple's iOS, and
the full-featured paid version has been downloaded nearly 7 million times as of September 2010.[13] The
Android version of the game was downloaded more than 1 million times within the first 24 hours of release,[40]
even though the site crashed at one point due to the load,[41] and over 2 million downloads in its first
weekend.[42] Rovio receives approximately US$1 million per month in revenue from the advertising that
appears in the free Android version.[3]
According to Rovio, players log more than 1 million hours of game time each day on the iOS version of the
game,[12] 3.33 million hours per day across all platforms[43] and 40 million monthly active users.[44] In
November 2010, digitaltrends.com stated that "with 36 million downloads, Angry Birds is one of the most
mainstream games out right now".[5] MSNBC's video game news blog has written that "[n]o other game app
comes close" to having such a following.[45] The Christian Science Monitor has remarked, "Angry Birds has
been one of the great runaway hits of 2010".[6] In December 2010, in honor of the one-year anniversary of the
release of Angry Birds, Rovio Mobile announced that the game had been downloaded 50 million times, with
more than 12 million on iOS devices[3] and 10 million on Android.[46] By June 2011, the game had reached 250
million downloads, including Angry Birds, Angry Birds Seasons and Angry Birds Rio.[47] In the history of the
Apple App Store, Angry Birds holds the record for most days at the top of the Paid Apps chart, having spent a
total of 275 days at the No.1 position; Angry Birds Rio has been No.1 for a total of 23 days, ranking ninth on
the list.[48]

Awards
In February 2010, Angry Birds was a nominee for the "Best Casual Game" award at the 6th annual International
Mobile Gaming Awards in Barcelona, Spain.[49] In September 2010, IGN named Angry Birds as the fourth best
iPhone game of all time.[50] In April 2011, Angry Birds won both the "Best Game App" and "App of the Year"
at the UK Appy Awards.[51] At the 15th edition of the Webby Awards, Angry Birds was awarded "Best Game
for Handheld Devices".[52]

Ports
Since its initial release for the Apple iPhone and iPod Touch, Rovio has released versions of Angry Birds for a
number of additional devices. One of the first was for Nokia's N900 handset,[38] through its Ovi Store. An
iPad-exclusive version, Angry Birds HD, was released at the same time the iPad itself was released in April
2010.[53] In August 2010, Angry Birds was made available to the Palm Pre phone running Palm's webOS
operating system through its App Catalog online store.[54] Symbian^3 phones received a version of the game in
October 2010,[55] which initially includes only the "Poached Eggs" and "Mighty Hoax" episodes.[56] A
subsequent free update added the "Danger Above" and "The Big Setup" episodes, and all associated content and
improvements.[57]
In May 2010, Rovio announced plans for a version for devices using Google's Android operating system,[58]
with a beta version being released through the Android Market in September 2010.[59] However, the full
Android version of the game was first released instead on GetJar in October 2010,[39] though it was
subsequently released on Android Market within days.[40] Rovio officials noted that GetJar had a more global
reach than Android Market, and GetJar's availability on other smartphone platforms (including Symbian and

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Windows Phone 7) would make cross-platform promotion of the game easier.[39] Unlike the previous versions,
Angry Birds for Android is a free, ad-supported application, as paid applications aren't supported on Android in
some nations.[40] The upcoming "Bad Piggy Bank" update for Android will allow players to buy out the in-game
ads.[46]
Near the end of 2010, Rovio stated that it was developing new ports of the game, this time for devices outside of
the mobile phone market. In January 2011, three of those ports launched. First, Sony announced the release of
Angry Birds for its PlayStation Portable handheld system in the form of a PlayStation mini game that includes
nearly 200 levels from the original game; the version is also playable on the PlayStation 3.[32][60] Next, Rovio
announced the release of a Windows version of the game[61] on January 4, 2011, available for sale exclusively
from Intel's AppUp center, which included 195 levels at launch and plans for exclusive features not available on
the smartphone versions.[62] One day after the Windows version was released, the Mac App Store launched,
with one of the first offerings being its own version of Angry Birds.[63] Ports of Angry Birds are also proposed
for the Xbox 360,[3] Wii,[3] Nintendo DS[64] and Nintendo 3DS[65] systems, as is a version for Facebook,[66]
which is expected to launch in May 2011.[19]
In October 2010, Microsoft suggested on one of its websites that a Windows Phone 7 version of Angry Birds
was in development. After Rovio complained that Microsoft had not asked permission to make such a
statement, noting that at that time it had not committed to design a Windows Phone version, Microsoft was
requested to revise its site to remove references to the game.[39][67] Rovio has since confirmed that it is indeed
preparing a Windows Phone 7 version of Angry Birds,[68] which was released on June 29, 2011.[69]
The popularity of Angry Birds has helped spread the game to other devices that were not initially designed as
gaming machines. Barnes & Noble announced that a future update for its Nook Color e-reader will let the
Android-based device run applications, including a port of Angry Birds.[70] In June 2011, Rovio announced
plans to partner with Roku to include a version of Angry Birds on a new model of its Internet-connected set-top
box expected in the 3rd quarter of 2011.[71]
In May 2011, an in-browser version of Angry Birds was released. Currently available in beta form, the game
uses WebGL or Canvas and will be distributed through the Chrome Web Store for use with Google's Chrome
web browser. While it is expected to run on any WebGL- or Canvas-enabled browser, it will feature exclusive
content when played on Chrome, such as exclusive levels[72] and the so-called "Chrome Bombs". The game will
offer offline playability, and feature 60 FPS gameplay and a selection of graphics settings to accommodate a
variety of hardware capabilities.[73]

Special editions
Angry Birds Seasons
In October 2010, Rovio released a special Halloween edition of the
game.[74] Angry Birds Halloween, exclusive to Apple iOS at the
time and a separate application from the main game, included new
levels with Halloween-themed music and graphics.[74] In December
2010, Rovio released Angry Birds Seasons to iOS, Android and
Symbian^3 devices.[75][76] Seasons introduced 25 Christmas-themed
levels, one for each day leading to the holiday, similar to an Advent

Angry Birds Seasons
Developer(s)

Rovio Mobile

Publisher(s)

Rovio Mobile

Version

1.5.0 (iOS)
1.5.1 (Android)

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calendar.[75][76] All versions include the previously-exclusive
1.5.0 (Symbian^3)
Halloween levels and are offered as separate, stand-alone paid
applications, with the exception of the free, ad-supported Android
Platform(s)
iOS, Android, Symbian^3
[77]
version;
Angry Birds Halloween users on iOS received the
Release date(s) October 21, 2010[74]
[75]
Seasons levels as a free upgrade.
The Halloween version was
given the episode title "Trick or Treat", while the Christmas episode was entitled "Season's Greedings". In
February 2011, Rovio released a new Valentine's Day update to Angry Birds Seasons, entitled "Hogs and
Kisses", complete with new themed levels and graphics, as well as the option to send Angry Birds-themed
Valentine's Day messages through Facebook.[78] In March 2011, Rovio released a new St. Patrick's Day update,
entitled "Go Green, Get Lucky",[79] followed by an Easter update, entitled "Easter Eggs", in April 2011[80] and
a summer update, "Summer Pignic", in June 2011.[81]

Angry Birds Rio
Angry Birds Rio, a stand-alone edition tying into the release of the
20th Century Fox animated film Rio, was launched for iOS, Android
and Mac OS X in March 2011.[82] In this version, the Angry Birds
characters appear in Rio de Janeiro and interact with characters
from the film.[82] Angry Birds Rio initially includes two chapters,
each with 30 levels; the Angry Birds rescue caged exotic birds in the
first chapter[83] and attack evil marmosets in the second, third and
fourth chapters.[84] The game also includes new hidden items and
planned level updates in May, July, October and November
2011.[85] The reception of Angry Birds Rio has been positive, with
Ryan Rigney of GamePro saying the iOS version "boasts some
notable improvements on its predecessors"[86] and Levi Buchanan
of IGN, in his review of the Android version, calling the game "a
smart, snappy new chapter for the series".[87] Since release, Angry
Birds Rio has been downloaded more than 10 million times.[88] The
first update, a new chapter called Beach Volley, was released in
May 2011 for Symbian, iOS and Android and included 30 new game
levels.[89] The second update, the first half of a chapter called
"Carnival Upheaval", was released in June 2011, with the second
half coming in July, followed by two more updates planned for
October and November.

Angry Birds Rio

Title card for Angry Birds Rio

Developer(s)

Rovio Mobile

Publisher(s)

Rovio Mobile

Version

1.2.2 (iOS)
1.2.1 (Android)
1.2.0 (Symbian^3)
1.1.1 (Windows)

Platform(s)

iOS, Android, Mac OS X,
Windows, Symbian^3

Release date(s) March 2011

Angry Birds Magic
A special version of the game, called Angry Birds Magic, will be developed exclusively for Nokia's
NFC-enabled Symbian devices. This version of the game will include functionality that will unlock game levels
upon contact with another NFC-enabled phone running the game. A free version of Angry Birds Magic will
come preinstalled with all NFC Symbian devices to be sold in 2011, starting with the Nokia C7.[90]

Other media
The Angry Birds characters have been referenced in television programs throughout the world. The Israeli

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comedy show Eretz Nehederet (in English: a Wonderful Country), one of the nation's most popular TV
programs, satirized recent failed Israeli-Palestinian peace attempts by featuring the Angry Birds in peace
negotiations with the pigs. Clips of the segment went viral, getting viewers from all around the world. The sketch
received favorable coverage from a variety of independent blogs such as digitaltrends.com,[5] hotair.com[91]
and intomobile.com,[92] as well as from online news media agencies such as Haaretz,[93] The Christian Science
Monitor,[6] The Guardian,[94] and MSNBC.[45] American television hosts Conan O' Brien, Jon Stewart and
Daniel Tosh have referenced the game in comedy sketches on their respective series, Conan, The Daily Show,
and Tosh.0.[95][96][97] In the 30 Rock episode "Plan B", guest star Aaron Sorkin laments, "Our craft is dying
while people are playing Angry Birds and poking each other on Facebook." In February 2011, American
journalist Jake Tapper mockingly introduced U.S. Senator Chris Coons as the "Angry Birds champion of the
Senate" during the National Press Club's annual dinner.[98] Some of the game's more notable fans include Prime
Minister David Cameron of the United Kingdom, who plays the iPad version of the game, and author Salman
Rushdie, who claims he is "something of a master at Angry Birds".[99]
Angry Birds and its characters have been featured in advertisements for
other products. In March 2011, the characters began appearing in a
series of advertisements for Microsoft's Bing search engine.[100] At the
2011 South by Southwest festival in Austin, Texas, Nokia used scrims on
a downtown building to project an advertisement for its new N8 handset
that included the game's characters.[101] A June 2011 T-Mobile
advertisement filmed in Barcelona, Spain included a real-life mock-up of
the game in a city plaza.[102]

A screenshot from the T-Mobile
Advert

The game's popularity has spawned knock-off and parody games that
utilize the same basic mechanics as Angry Birds. For example, Angry Turds features monkeys hurling feces and
other objects at hunters who have stolen their babies.[103] Another game, entitled Chicks'n'Vixens and released
in beta form on Windows Phone 7 devices, replaces the birds and pigs with chickens and foxes,
respectively.[104] The developer of Chicks'n'Vixens intended the game as a "challenge" to Rovio Mobile, which
has stated that a Windows Phone port of Angry Birds won't be ready until later in 2011.[104]
Angry Birds has inspired works of philosophical analogy. A five-part essay entitled "Angry Birds™ Yoga – How
to Eliminate the Green Pigs in Your Life" was written by Giridhari Dasa of ISKCON Brazil, utilizing the
characters and gameplay mechanics to explain various concepts of yoga philosophy as understood by Gaudiya
Vaishnavism.[105][106][107][108][109] The piece attracted much media attention, in Brazil and abroad, for its
unique method of philosophical presentation.[110][111][112][113] The piece was also recognized and appreciated
by Rovio Mobile's Peter Vesterbacka, who was prompted to comment, "Very cool! I can see Angry Birds Yoga
becoming a worldwide craze;-) ".[105]
Rovio is investigating ways to expand the Angry Birds brand, including merchandise, television shows and
movies.[114] The game's official website offers plush versions of the birds and pigs for sale, along with T-shirts
featuring the game's logo and characters.[115] Mattel will distribute an Angry Birds board game, titled "Angry
Birds: Knock on Wood", beginning in May 2011.[116] Mikael Hed, CEO of Rovio Mobile, has envisioned a
feature film in the stop-motion animation style of Aardman Animation.[114] Hed acknowledges that such a film
would be years away, and that Rovio must keep the characters relevant until then, by producing sequels or new
ports of the original game.[114] Rovio officials have hinted that one such "sequel" will be told from the pigs'
point of view.[117]

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References
1. ^ http://store.ovi.com/content
/61009?clickSource=search
2. ^ a b c "Angry Birds Review" (http://wireless.ign.com
/articles/107/1070605p1.html) . IGN.com. February
11, 2010. http://wireless.ign.com/articles
/107/1070605p1.html. Retrieved March 24, 2011.
3. ^ a b c d e "The Supremely Addicting Angry Birds
Hits 42 Million Free and Paid Downloads"
(http://www.symbian-freak.com/news/010
/12/angry_birds_hits_42_million_free_and_paid_dow
nloads.htm) . SymbianFreak.com. October 22, 2010.
http://www.symbian-freak.com/news/010
/12/angry_birds_hits_42_million_free_and_paid_dow
nloads.htm. Retrieved December 11, 2010.
4. ^ BBC News (July 22, 2011). "Angry Birds maker
Rovio sued over app patents" (http://www.bbc.co.uk
/news/business-14245047) . http://www.bbc.co.uk
/news/business-14245047. Retrieved July 22, 2011.
5. ^ a b c Van Camp, Jeffrey (November 23, 2010).
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http://en.wikipedia.org/wiki/Angry_Birds

External links
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