Logical (Log!cal) (1991, C64)

Logical, often stylized as "Log!cal", is puzzle game by German company Rainbow Arts. The game is divided into levels. Each levels consists of a set-up of wheels with 4 slots. Some of the wheels are connected with rails. Balls of different colours will, one after another, enter the level of a certain rail and go back and fourth until they fall into a slot of a wheel. If all four slots of a wheel are filled with balls of the same colour, they will disappear. The goal is to do this on every wheel at least once in each level. For this, you can move balls to empty slots between wheels if they are connected. You can turn the wheels, too. Balls on the "entry rail" need to be inserted into a slot quickly, because the rail will be covered over time, giving the ball less and less space to move, until it finally cannot reach any wheel. If you fill in the ball in time, the blocking of the rail will be removed.
The game was also released for PC, Amiga, Commodore CDTV, NEC PC-98, Game Boy Color and Atari ST.