Quake 1

To start, press any key. Arrow/WASD keys to move, Ctrl to shoot, space to jump, mouse click to unbind the cursor, Esc to pause. Hold Tab to check monster killed/left and time taken. You can press the numbers 1-8 to switch weapons if you have picked them up. If you die, press any key to continue.

On the menu, use arrow keys to move the cursor and Enter to select an option. You can change the controls in the options menu. Have fun!