Serious Sam 2 Codes -

Cheat mode:
Hold and press , , , , , repeatedly at the main menu until the cheat option appears at the bottom. Then, pause your game and press to access the cheat menu at the bottom of the pause menu. After cheats are activated, a message will appear in the top right part of the screen during game play. REMEMBER: The cheat options can be activated in online games, but may require the game host to first enable cheat mode.

Lava stage: Armor puzzle:
Just before you get the mini-gun, there is a door on your right. Open it and there will be armor on the other side. You must to step on the correct letters. The order is: S, E, R, I, O, U, S.