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Sumo Fighter
Books: GAME BOY Secret Codes - Secret Codes 2003 - Game Boy Games Secrets

02B-AFA-E66     Start with 2 energy bars
05B-AFA-E66     Start with 5 energy bars
08B-AFA-E66     Start with 8 energy bars
FAE-C8A-4C1     Infinite energy
*= Not on continue
012-0BF-E62     *Start with 2 lives
042-0BF-E62     *Start with 5 lives
072-0BF-E62     *Start with 8 lives
092-06F-F7E     When screen comes up asking easy or hard level, press 'Down" 3x and 
press 'A'. You can now play super hard mode right away (makes display look weird)