"Square Bird" is a free game developed by Vishnu Devasi for iPhone users. This game is a great way to pass time and challenge your gaming skills. The game is based on building an egg tower and passing through barriers, but with a twist. The player has to keep the egg tower smooth and at the right level and timing to avoid obstacles and reach the next level.

The game is easy to play, but challenging enough to keep you engaged for hours. The controls are simple, and the graphics are colorful and attractive. The game also features a Square Bird Fever mode, which can be unlocked by landing perfectly on the grass three times. Overall, "Square Bird" is an excellent game for casual gamers who love a good challenge and want to have fun on their iPhone.