Here are the cheats for Wicked Quest. Press the ` key which is directly to the left of the number 1 on the top row of most keyboards. It's also between the escape and tab keys. These codes can only be used in story mode, and make sure to enter them without the colon at the end.

samhain - Teleport to any level.
misfits: Immediately get 20 health.
coffinshakers - Grants you an extra life.
nekromantix: Get 100 bone dust.
calabrese: Tells you what the closest monster is.
balzac: Sets bone dust to 200.
blitzkid: Gives you every single weapon all at once.
creepshow: Allows you to enable god mode and make yourself invincible.
diemonsterdie: gives you 100 jack o'lanterns.
murderland: Grants exactly 13 jack o'lanterns.
koffinkats: Spawns a coffin with a random item at your location.
theother: Allows you to save the game on any level, but only once per level.
wednesday13: Enables everything, giving you maximum stats and god mode.