Castle Adventure is a game made in 1984 about a cloverleaf person trapped in a deserted castle with monsters roaming around. You have to find a way to escape the castle by searching for clues.

You move around with the arrow keys. If you manage to find a weapon, you can attack enemies by simply moving into them. Similarly, you can pick up objects on the ground by moving into them. You can also type in commands such as "LOOK DESK", "TAKE KEY", "READ BOOK", and "DROP FLASK". There are treasures to be found and monsters to be slain in order to increase your score.

In this TAS, Ilari & Truncated clear the game in a blindingly fast 19.45 seconds utilizing subframe optimization and rapid keyboard-twisting input. For details, read the authors' comments.

The run is so fast that the emulator can't draw all of the game's video output, so the downloadable encodes are made with a hacked version of the emulator that draws all of them. There is also a secondary YouTube encode that slows the gameplay footage down to 14% speed.