Monk mode (DOS version)
Press [Ctrl] + [F3] to enable monk mode. Press T, Y, U or G, H, J or B , N, M to control the monk. Press [Tab] to use the monk.

Monk mode (Windows version)
Open the main Lode Runner menu screen. Then, click the Left Mouse Button on the upper left corner of the menu screen, and type "cthulu" or "yog". If you entered the code correctly, you will hear a sound. Press T, Y, U or G, H, J or B , N, M to control the monk. Press [Tab] to use the monk.