super cool game. too bad i only have it on emulator (about to get it for my snes)
SUPER MARIO BROS
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graphics were changed, sound was changed. bowser looks a lot different
SUPER MARIO BROS: LOST LEVELS
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no changes that i know of. this is the only game you can play LL on, so im not sure. the graphics are the same as the smas + w version of smb1
SUPER MARIO BROS 2
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graphics are changed, sound is changed. also, you cant see the crystal ball inside birdo.
SUPER MARIO BROS. 3
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graphics are changed, sound is changed, better backgrounds. some of the items in toads houses are different.
overall, this game is AWESOME as i said before, and anyone who doesnt have it MUST get it