The famous Angry Birds game is now available as a free version on social network Facebook.
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The Facebook game, however, allows users to pay for extra birds and other in-game extras.
The website game is similar to the iPhone app. The only difference is players have to use a mouse to sling birds across the game's landscapes rather than a finger, the Daily Mail reported.
Peter Vesterbacka, chief marketing officer of game-making company Rovio, said he hoped up to 40 percent of Facebook users would pay for in-game extras.
Rovio has never spent any money on advertising or marketing Angry Birds, the report said.
It had made 50 failed games before Angry Birds. The company also sells a million Angry Birds toys and a same number of T-shirts every month.
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