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Cheat mode:
At the main menu, hold the Left Analog-stick and press Black, White, Y.

Mental mode:
Successfully complete the game in Serious mode, then start 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.

Developer cheats
Click and hold the Left Analog-stick and press [Black], [White], [Y]x3 at the main menu. This will unlock the "Cheats" and "Developer Cheats" options. The "Developer Cheats" will allow you to go to certain checkpoints.

All characters
When you play in one player mode, you will get Serious Sam. After the first level loads and saves, exit. Go to one player mode and start a new game by pressing [Y]. A messed up name will appear. Do not delete that name; just select "Done". Allow the game to load and save, then exit and go to one player mode. If done correctly, Serious Sammy should be there. Keep doing these steps until you get all the charcaters. Note: When you get Serious Sam 2, do not select "OK"; there is no difference.

Fly around
Enable the "Cheat mode" code. Go to the Alley Of The Sphinxes level. When there, instead of going straight into the level, turn around and head for the mountains. After a while you will begin to lose health very fast. Give yourself full health when you are in danger of dying. In a short while, you will get to the top of the mountain and stop losing health. You may want to get full health because you will lose about 30 when you fall to the other side. You will now be in more desert. Keep running for about twenty minutes and you will walk off the desert and enter an area that looks like all sky. While here, when your gun moves it looks strange. When you slice your knife around, the whole screen will get covered by an image of it. The best part about this area is that you can fly. Hold [Jump] to do so. You can travel anywhere in the level. To land, hold [Crouch].

Hidden level
Destroy all the statues in the Valley Of The Kings level.