S is a free physics game developed by BuildMan for Android devices. The game's objective is simple: to clear all stages by using your head to drop all the red balls coming down. The game can be operated easily with one hand, making it ideal for quick gaming sessions.

S is a puzzle game that challenges players to use their problem-solving skills to complete each level. The game's rules are straightforward - touch the screen to drop the ball and clear all the red balls. The game's physics engine is impressive, providing a realistic experience that adds to the game's overall appeal.

Overall, S is a fun and challenging game that is perfect for puzzle lovers. The game's simplicity makes it easy to pick up and play, while the challenging levels will keep you engaged for hours. If you're looking for a free physics-based puzzle game, S is definitely worth checking out.