Super Mario Bros. Deluxe was a port of Super Mario Bros. to the Game Boy Colour, with the addition of some of the levels from Super Mario Bros. 2 (Japan) and also a mode called You vs. Boo.
You were given a long stage where you would race a Boo along it, with things like flip blocks and enemies in your way. Boo got faster every time you beat it.
Mario vs Luigi just reminded me of it, i.e. Nintendo has done it before and it worked quite well.
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