To completely beat the game, you have to unlock and beat all levels, get all the star coins in the levels, and beat Bowser's castle. Then, go to world 9 and beat all levels, including 9-9. To get 9-9, you have to get all star coins in the previous world 9 levels.
secret exits
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
beat world 6
Did you mean New Super Mario Bros.? Yoshi isn't in that, but he is playable in Super Mario 64 DS, and you can ride him in New Super Mario Bros. Wii!
No, but the Mega Mushroom does appear in New Super Mario Bros.
secret exits
if you mean new super Mario bros, then you beat world 6 castle when you are mini Mario.
New Super Mario Bros. happened in 2006.
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
Just beat 5th boss as Mini Mario.
die
beat world 6
beat world one.
New Super Mario Bros. happened in 2006.
Super Mario bros super Mario bros 2 super Mario bros 3 super Mario world super Mario 64. Super Mario sunshine new super Mario bros ds super Mario galaxy new super Mario bros wii super Mario galaxy 2 (any other games please check something else
You have to beat Mummipokey (the boss of World 2) as mini Mario.
You beat it.