Serious Sam: Monsters spawned from another dimension are trying to make The Milky Way Galaxy their personal trashcan. As attempts to defend the solar system fail, the fate of the Earth (that's US people!), and even the universe rests with one man. YOU are Sam 'Serious' Stone, a legend in your time. Sam is our only hope against these mischievous miscreants and their evil leader, the one we call 'MENTAL'. The only way to get Mental and save us all, is to use an ancient artifact called the 'Time Lock', to teleport back in time. Don't ask us how or why this is happening. All we can tell you is, this is Serious... xboxcheat-codesserioussam

Cheat Codes Cheat mode: At the main menu click and hold the Left Analog-stick and press Black, White, Y. A "Cheats" option will now appear at the main menu. Mental mode: Complete the game in Serious mode, then begin a new game. Mental will be fading in and out under Serious. In Mental mode, all the enemies will appear and disappear. Binary counter: In the Great Pyramid stage, just before you enter the pyramid, you may have noticed a panel above the entry with alternating I's and O's. This is a timer counting down in binary. The timer starts at 1,023 and goes down from there.