Definitly Super Mario World, although I hated the Tubular level soooo much! There's still teeth marks on my controller.
Super Mario Bros.
Super Mario 2
Super Mario 3
Super Mario 64
Mario Sunshine
Super Mario Land 1-3 (GAMEBOY)
Super Mario World (SNES)
Super Mario World 2 Yoshi's Island
Paper Mario (N64)
Super Mario RPG (SNES)
OTHER