Mario and Luigi are doing some underground plumbingwhen all sorts of weird creatures come flying out of the pipes. Turtles, crabs - even fighterflies - attack the helpless  Mario Bros. Its up to you to kick, punch, and knock out these sewer pests before time runs out! But  beware. Just when you think you got rid of them, they come back for more! Play against the computer, or with a friend - either way, this is one underground classic youll want to play time and time again!

 Changes:

 1. If you hit the roof, it will fall down.
 2. Game has become very difficult! Nightmare!!!
 3. Mario and Luigi have 4 lives
 4. New logo.
 5. Characters (Mario, Luigi and enemies) can walk up the stairs!

 ROM / ISO Information:

 Country: USA
 Internal checksum C4C3949A
 CRC32 a6de1b55
 MD5 8d8e0b86dd870302bf4a994e76c55c83
 SHA-1 9286a2db471d51713e9b75e68b47ffbf11e2d40b
 Mario Bros. (U) [!].nes (GOODNES 3.14)

 Released by Guyver (X.B.M.)