Make sure you are on foot, and not in a mech. Then, press [F6] to quick save the game. Press T to enter the "Talk" function. Type "mpclip" and press [Enter]. Look straight down at the ground. Hold your "Move Forward" button. If done correctly, you should have gone through the ground. Keep the button held until the game begins to flash and glitch. Press T to enter the "Talk" function. Type "mpclip" and press [Enter]. In a few seconds the screen should turn black. If it does not, try moving around or press T to enter the "Talk" function, type "mpclip", and press [Enter] again. Then, try moving around again. After the screen turns black, press [Esc] to enter the main menu. Go to the load screen and click "Quick Load". When the game completes loading, press T to enter the "Talk" function. Type "mpclip" and press [Enter]. You should now be in mini-mech mode. Note: If this method does not work, patch the game to v2.0 or above.