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World C-3 is the third level of World C in Super Mario Bros.: The Lost Levels. It is a redone version of World 7-3. In the original game, the level has a monochrome palette, whereas it has the standard grassland palette in Super Mario All-Stars.
World C-3 consists of small platforms with Super Springs placed on several of them, with Lakitus throwing Spinies during the first half of the level. Wind will also be blowing throughout the level, making landings difficult. The third Super Spring has a Koopa Paratroopa above it that the player needs to avoid as they time their jump. After the fourth Super Spring are a group of platforms and pipes with Piranha Plants. Halfway through the level, after the fifth Super Spring, is a ? Block with a power-up. After the sixth Super Spring is a scale lift, and after the seventh Super Spring are small platforms with Fire Bars and a Koopa Paratroopa between them before the Goal Pole.