Is There a "Negative World" in New Super Mario Bros. Wii? No—Only Mirror Mode and Nighttime 1-4

No. New Super Mario Bros. Wii has **no "Negative World," "Minus World," or World 9**. The game ends at **World 8-4**.

What You Might Be Thinking Of

• World 1-4 "Dark" Version: After beating the game once, World 1-4 gets a **nighttime palette swap** (darker sky, different enemies). Only this level changes.
• Mirror Mode: Unlocked after 100% completion (all Star Coins). Flips every level horizontally—left↔right. Not a new world.
• Super Mario Bros. (NES) "Minus World" (World -1): Famous glitch via backward wall jump in 1-2. Doesn't exist in NSMB Wii.
• Super Mario World (SNES) "Star World" / "Special Zone": Hidden worlds accessed via secret exits.
• Fan Hacks / ROM Mods: Newer Super Mario Bros. Wii, Super Mario Bros. Wii: Minus World (homebrew) add custom worlds.

Clarify: If you saw a video claiming "World 9-9," it's either a **different game**, a **mod**, or **clickbait**.