Shining Soul - Platform: Gameboy Advance

Advance mode 
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To get the advance mode simply finish the game once with any 
character. The advance mode is slightly harder than the normal 
mode and you'll encounter a few new ennemies. 

Unlimited money
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Enter a shop. Move one of your items to the "Sell" block and 
press R to move it back to your inventory. Next, pick an item 
in the shop and move it to your inventory, but do not buy it. 
Finally, press R and the item you never bought will jump to the 
"Sell" block. You can sell the shopkeeper their own merchandise.