Muscle Boy is a free game available for iPhone users developed by BIGDOG GAMES CO. LIMITED. The game is suitable for all ages and is designed to provide a fun and entertaining experience. The objective of the game is simple - tap the screen when the pointer points to the green and blue bars. The game also allows players to upgrade their boy to make them stronger.

One of the standout features of Muscle Boy is its perfect design and sense of humor. The game is full of funny moments that are sure to keep players entertained. Additionally, the game is fully supported on all iPhone models, making it a great option for users of all ages. Finally, the best part is that Muscle Boy is completely free to download and play.