Angry Birds

Prototype Info Prerelease Info Debug ContentThe level editor we needed...but not the one we deserve. Unused AudioThe unsung squawks and squeals of bird & pig warfare. Unused GraphicsBirds, blocks and backgrounds, oh my! Unused LevelsThe structures that the Bad Piggies left on their drawing board. Unused Code Unused Game ModesStuff that honestly would've spiced up the gameplay, but never made the final cut. Online FeaturesTransactions and competition that flew away one day. Version Differences

Unused Text#

Tutorial text#

HELP_TITLE_HOWTOPLAY=How To Play
HELP_TITLE_BLUE=Blue Groupie
HELP_TITLE_YELLOW=Yellow speedster
HELP_TITLE_BLACK=Black Blaster
HELP_TITLE_GREEN=Eggy Bomber
HELP_TITLE_SPECIAL=Special Moves
HELP_TEXT_HOWTOPLAY_1=Launch the birds by using the slingshot
HELP_TEXT_HOWTOPLAY_2=Destroy all piglettes to clear the level!
HELP_TEXT_BLUE=Strong against ice blocks
HELP_TEXT_YELLOW=Strong against wood blocks
HELP_TEXT_BLACK=Strong against stone blocks
HELP_TEXT_GREEN=Fat & Lazy
HELP_TEXT_SPECIAL=Activate special move by tapping the screen while the bird is flying in the air
HELP_SUBTITLE_SPECIAL=Special move:
HELP_SPECIAL_BLUE=Group Attack
HELP_SPECIAL_YELLOW=Turbo Boost
HELP_SPECIAL_BLACK=Explosion
HELP_SPECIAL_EGGY=Egg Grenade

In "TEXTS_BASIC.dat" and "english.txt" files, there are text strings suggesting that the tutorial screens were supposed to have text aside of, or maybe even instead of images. Notably, these strings mention which bird is effective against which material, with Matilda ("green" strings refer to Matilda) being described as "Fat & Lazy", and reveal the names of abilities and birds' original names.

Early Mighty Eagle#

Before Mighty Eagle was added to the game in version 1.5.0, there was an early version of the Eagle that was found in versions 1.4.0-1.4.1 that was going to work a lot differently. This early version shows that the Eagle was originally going to fall straight down onto wherever the bait initially lands, whereas the finalized version has the Eagle swoop in.

Sprites#

Bait#

Version 1.4.0 features a much different sprite for the Eagle bait, where it was going to look like a mouse. In version 1.4.1, this was changed to early rendition of the sardine can that's slightly slanted.

1.4.0/1.4.1 HD	1.4.1	Final

Eagle#

Unlike the Bait, Mighty Eagle himself didn't change all that much, design-wise. In version 1.4.0, his sprite is completely unobscured. In version 1.4.1, a blur effect similar to that of Chuck's ability sprite was appiled to the Eagle's sprite. The finalized version seems to use a darkened version of 1.4.1's sprite.

1.4.0/1.4.1 HD	1.4.1	Final

UI#

Early buttons for the Mighty Eagle.

A badge of some kind, presumably intended for the Level Skipped screen after using the Eagle.

An early tutorial screen for the Mighty Eagle, notably showing the mouse instead of the sardine can.

Sounds#

Oddities#

Green Matilda#

All of Matilda's sprites are labeled as "BIRD_GREEN" in the INGAME_BIRDS_1 sprite sheet. The aforementioned "TEXTS_BASIC.dat" and "english.txt" files also has text strings calling Matilda green. This is a remnant of early development as concept art for a bird in an ugly green color exists alongside the violet-colored bird that was intended to use the violet feathers that were also leftover in the aforementioned sprite sheet.

Blues and Matilda's Swapped Ability Sounds#

In-game, The ability sounds for The Blues and Matilda are swapped. "special egg.wav" is used for The Blues' ability, while "special group.wav" is used for Matilda's ability.

In the build seen in the In-game Trailer, the Blues use the correct ability sound, so it's likely that this was a decision made late in development. This oddity was also fixed in Flash-based webgames such as Friends.

Red's Blinking and Flying Sprites#

Red uses the same sprite for his blinking and flying sprites, despite the other birds using two separate sprites for their blinking and flying state.

Interestingly, the expression chart sent out to licensees during 2010-2011 contains a unique blink sprite, and his flying sprite is not present.

Mighty Eagle's Radial Sprite#

Mighty Eagle has a spinning sprite of sorts stored in the INGAME_BIRDS_2 sheet, which is supposed to display after he collides with the ground. While this sprite displayed in earlier versions, it doesn't in later versions due to a bug.

Differently Pitched Audio in PC/Wii U Versions#

In PC versions, the game targets a sample rate of 44100hz for audio, which means any audio files that aren't stored at that sample rate will end up being played at a different pitch in-game. The most notable audio to be affected by this are Bubbles' sound effects (which all have a sample rate of 48000hz) and Birdday Party's ambience (which has a sample rate of 32000hz).

Birdday Party Ambience#

Internal Project Name#

The internal name of the game is Linnut, roughly "Birds" in Finnish according to the game executable build path in older versions¹²³⁴, with or without Rovio. The sound file names for the cutscenes⁵ could also suggest this translation.

References#

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