Numpad 1: God Mode
Numpad 2: Unlimited Potions
Numpad 3: Always Roll 6
Numpad 1: God Mode - you must take damage at least ONCE. Then toggle this on, and then even when you take damage, you cannot be killed. Basically you can continue to play as long as you like.
Numpad 2: Unlimited Potions - make sure you have entered the game and can see your potions. Toggle this on and you have unlimited potions.
Numpad 3: Always Roll 6 - you need to have rolled the dice at least once, then toggle this on and you can see that when the dice complete you have rolled all 6.