Short answer: 210 levels1.
Long answer, they are always adding more and it depends on the package you get and what platform you run it on.
[1] http://iTunes.apple.com/us/app/angry-birds/id343200656?mt=8#
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Eight: Default Birds: Regular Red Bird Trio- Bird (Tiny Blue Bird) Turbo Bird (Yellow Bird) Egg- Bomb Bird (White Bird) Bomb Bird (Black Bird) Unlocked in "Danger Above": Boomerang Bird (Green Bird) Unlocked in "The Big Set Up": Immortally Bird (Big Red Bird) Boomerang Bird (If you didn't unlock beforehand)
20 levels
There are 9 levels. 3 levels of each of the 3 environments.
six
over nine
Not if it is the only game that you play. If you play Angry Birds along with many other games, you could be considered a gamer.
10 birds
it is a game that is used to past time, and u must also use strategy for wen u aim there r also many levels making the game go on forever
Four: Angry Birds, Angry Birds Seasons,Angry Birds Rio and Angry Birds Space.There are also the free versions of each of these except Angry Birds Space
Angry Birds is simply an application that many different birds sit on a catapult and you try to aim the catapult at the green monster things and there are hundreds of levels to be completed ( i haven't even completed the first pack yet!)
its a really fun game
The very first Angry Birds game was titled Angry Birds and came out for mobile devices which used Apple's iOS. Since then, many new versions have appeared which have their own theme, such as space or seasons.
Angry Birds is an amazing game with many different options. I would suggest playing the original with different level's it gives you a chance to get use to it.