Gauntlet Dark Legacy (USA) +4
Items in store are FREE
Unlimited keys
Unlimited potions
99999 gold

Items in store are FREE:
Items still have a cost, but when you buy them they don't take money
away, so as long as you have enough money to buy the item, its free

Unlimited keys:
Boxes, gate, etc don't take keys, you need at least one to begin with

Unlimited potions:
Once you have a potion, you can use it as many times as you want

99999 gold:
When you buy any item your money gets updates to 99999 gold, used in conjunction
with the first option, all you'll need is to buy a key, and then you'll have enough
money to buy whatever.

-dootdoo