A character will stumble if he/she runs into an enemy without a powerup that can eliminate them, or if he/she uses a springboard.
- If the character stumbles on a platform, he/she will fall through.
- If the character stumbles in mid-air, he/she will get back up on the platform below.
- If the character stumbles due to running into a Spike Block, he/she will fall through all platforms.
- If the character stumbles and lands onto an enemy's head while stumbling, the enemy will not be popped, instead the stumble lasts longer.