Serious Sam Cheats

The cheats are:please god,please fly,please invisible,please giveall,please ghost,please killall,please open,please ghost.

While playing a game, press ~ to display the console window, then enter one of the following codes to activate the corresponding cheat function:
Result
Cheat Code
God mode please god
All weapons please giveall
Full health please refresh
No clipping please ghost
Invisibility please invisible
Flight mode please fly
Unknown please killall
Unknown please open
Unknown please tellall

Strategy: by Robert Koning

Press the ` button to bring down the console. Then type one of the following. Make sure you press enter after every cheat and when you've finished typing the cheats press ` again.

God Mode-please god
Invisibility-please invisible
Kill all enemies-please killall
Give all weapons-please giveall
Open all doors-please open
Fly mode-please fly
No clipping-please ghost
Resets health to 100-please refresh
Show all messages from Netrisca-please tellall

please god - God Mode
please giveall - Give All Items
please killall - Kill All Enemies
please open - Open All Doors
please fly - Fly Mode
please ghost - No Clipping
please invisible - Invisibility
please tellall - Unknown Effect
please refresh - Unknown Effect  

When in Serious Sam, hit new game. Then go to custom levels. It should list every level in the game. Simply click on one and you will be transported there. Another cool thing about this is that you have any weapons that you normally picked up on the levels you skipped.