For the boss, either use the Giant Mario power-up or beat it the normal way.
To beat the normal way, you have to jump on the Boss when he comes down low.
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beat world 6
Mario Bros. Super Mario Bros. Super Mario Bros. 2 Super Mario Bros. 3 Super Mario World Super Mario Land Super Mario World 2 Super Mario Land 2 Super Mario 64 Super Mario Sunshine New Super Mario Bros. Super Mario Galaxy New Super Mario Bros. Wii Super Mario Galaxy 2
you have to beat the boss on world 5 in mini form
Beat Petey Pirahna on world 5 with a mini mushroom.
you have to be good and watch out from enmies and clifs