Pause the game and go to the password menu and select your cheat:

TSGDDYTD - INVINCIBILITY
VRYLTTL - ALL SPELLS
MKTS - BUILD FASTER
DCKMT - FULL UPGRADES
GLTTRNG - 10,0000 GOLD,LUMBER 5000 GOLD (REPEAT THIS CHEAT AND YOU WILL GET IT AGAIN).
NSCRN - FULL MAP