I'm too smart to find out the secret stages and show it to others.
| Unlockable: | How to unlock: |
| 75m | Play as DK 20 times |
| Big Blue (old) | Play as Falcon 10 times |
| Electroplankton | Complete Event Match #28 |
| Flat Zone 2 | Unlock Mr. Game & Watch |
| Frozen Hillside | Fight on the Halberd Stage 10 times |
| Great Sea | Unlock Toon Link |
| Green Greens | Play as Kirby 20 times (VS. Mode) |
| Green Hill Zone | Unlock Sonic |
| Jungle Japes | Fight in VS. Mode 10 times |
| Luigi's Mansion | Complete Classic Mode on Easy |
| Mushroomy Kingdom | Complete Event Match #19 |
| Pokémon Stadium | Fight in Pokémon Stadium 2 10 times (VS. Mode) |
| Port Town | Play as Falcon 10 times (VS. Mode) |
| Spear Pillar | Complete Event Match #25 |
