Knuckles Baseball is a single-player sports and casual arcade game in which players attempt to catch baseballs thrown by Sonic by pressing a button at the right moment. In this game, players are challenged to improve their timing and reflexes as they try to catch as many baseballs as possible, with the game increasing in difficulty as levels progress. It was designed for handheld electronic LCD platforms and was distributed as part of McDonald's Happy Meals in 2004, although it was not released globally. The game features simple mechanics focused on timing and quick reactions, with the challenge escalating as the speed of the baseballs increases with each level.