Beschreibung
The game consists of thirty-two cards, representing eight cats and twenty-four mice and the cards are lay out on the table in 8x4 grid face-down.

In his turn, the active player may turn any card face-up.
If it's a mouse he may continue his turn turning another card or decide to stop and take all visible mice in front of him.
If it's a cat, his turn is over and he must turn all cards face-down again.

When all mice were found, the player who has the most mice wins the game.

From Noris edition:

Katz und Maus - Wer findet die meisten Mäuse
translated: Cat and mouse - who finds the most mice

From the box back that also contains the games rules:

The game consits of 32 cards depicting cats and mice. 24 cards are with mice, 8 cards with cats. They are laid out face down in a 4 by 8 grid after a good shuffle. A player turns over cards on his turn. When the revealed card is a mouse its good and he can continue turning over cards. He can secure his winnings and keep the mice or continue. When a cat is revealed the players turn is immediately over, the face up cards are turned face down again, the next players turn begins. Whoever has the most mice when all mice are revealed is the winner.

A simple push your luck game for children.