Enter these codes on the keypad in the password option. Most can only be used once, though multiple items can be aquired.

Password	Effect
104734	Unlock Suzuki.
109031	+100 money.
164603	Unlock Buukegaruni.
193123	Unlock Yuba.
235786	All characters gain a level.
371274	All characters reset to level 1.
569814	Recieve an Aneki item.
593939	Recieve Kinka Goggles; when used in a stage they reveal the Kinka location.
695743	10 Kinka.
810401	Unlock Uzute.
828282	Unlock Stroganoff.
867934	Recieve Banker item.
941356	Recieve Boots.