There are hundreds of different ones. I am trying to find one my friend showed me on WORLD 1-A. Search on Google 'Super Mario bros ds glitches' and there are plenty available websites
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No. Super Mario Bros. 2 (on the NES) does not have 2 player co-op or any two player mode at all.
GET A LIFE. lalalala
This is what is sometimes called an 'easter egg' which does not affect the game in any way but it's just interesting. Mario does away with his cap (not the propeller cap; he needs that!) when he gets 99 lives in New Super Mario Bros. Wii. 99 is the maximum number of lives you can get.
if you hold L+R when you are selecting a profile, hold it down when you press A
To activate the debug mode, start the New Super Mario Bros. game cartridge, and in any part of the game, eject the game cartridge, then hold L+R+A+Left let go, hold B+Down let go, hold START+SELECT let go.