In memorial of Felix "Wiesi" Wiesner; 1977 - November 16th, 2023.

The Castle Cat series consists of several platformer games where players control a cat character. In the first game, players are instructed to use arrow keys to move the cat and guide it up the castle by jumping over clouds. Enemies like Knights and Clowns are placed in the clouds, with contact with Knights resulting in losing life and contact with Clowns granting bonus points. A tornado can push the cat away. Players have nearly 2 minutes to reach the top. When the cat loses, a game over the screen shows Castle Cat with bandages, expressing disappointment.