Games in which the player has to navigate a ball through a level. This is either done through direct control of a ball, or tilting the whole environment (like a wooden labyrinth game). The ball correctly responds to physics which adds to the difficulty of the game. Possibly the player has to collect power-ups or avoid hazardous obstacles or reach an exit.
Game Exclusions: Games where the player doesn't have continuous influence over the ball's motion, such as golf, pinball, or billiards games, or where the influence is limited to other objects.
