The player guides Ratty the police mouse through the mansion of the cats called the Meowkies to retrieve stolen goods. The player uses the control pad to move Ratty left or right and A button to operate doors. The mansion has six floors, of hallways in which the stolen items are stashed. Ratty and the cats move between floors by bouncing on trampolines at various places in the house. Both Ratty and the cats can land on a floor on the way up, but not on the way down. When they pass in the air, Ratty is unharmed by the cats, but if Ratty runs into a cat anywhere else, he will lose a life. The trampolines will break if Ratty bounces on them four times in a row. The trampolines change color depending on how many times Ratty has used them without a rest. In addition to the Meowkies, the boss cat Goro also roams around. He is faster, but less aggressive than the Meowkies. Throughout the levels, Goro hides behind the different recoverable objects. If Ratty recovers an item which Goro is hiding behind, the player receives 1000 points. A round is completed when all the loot is retrieved. If Ratty tarries too long, a "Hurry" message appears after which the music and the cats speed up, and more Meowkies are added. If the player waits too long after this, the "Gosenzo" coin (a green disk shape with Goro's face on it) will drop onto the top-middle platform and chase Ratty in a manner similar to the Meowkies, but more effectively. The "Gosenzo" coin can kill Ratty even if he is in the air. The third round and every fourth round after that is a bonus round. Ratty, unbothered by the cats, must bounce across a series of trampolines, popping fifteen different suspended red balloons, with a "Goro" along the way. A bonus is awarded if all the balloons are popped before the music ends. After every bonus round, a new feature is added to the gameplay, such as bells that freeze cats. The "Hurry" message will also appear sooner.