Unlockable Costume Codes
During play, press the Esc key and you can enter the codes before clicking "Unlock Content" to produce the corresponding gear.
373624 - Armament of Gaul set
437626 - Armament of Germania set
925678 - Garb of the Great Merchant
274267 - Shinobi Shozoku set
123 - Male and female skins
12345 Dress, skirtless, and adult skins
After completing the game, You can play it again with the same monsters but 30 levels higher.