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Mario Bros. (Arcade)
Mario and Luigi go into the sewers to take out turtles, crabs and flies. Probably the only game that centers around Mario and Luigi actually plumbing.
A snake-like creature whose purpose is a mystery, but could possibly be a fourth enemy type.
Unused poses for Mario (and Luigi). The first pose appears to be an alternate version of one of Mario's sprites shown when jumped on by the other player, although this version seems to have some incorrect pixels. The second pose appears to be Mario sitting down and letting out a breath, indicated by the white cloud. The third and fourth poses almost look like Mario riding something, but it is unknown what these poses were for.