The bouncing blade (also described as a spike creature) is an object that appears inside the second jar of World 5-2 in Super Mario Advance. It is a pointy light-blue object that lies on the ground, expanding and contracting repeatedly. If a playable character touches it, they lose a heart point. The bouncing blade cannot be taken out by normal means, as it is immune to the nearby vegetable and POW Block that can be plucked out of the floor and thrown at it. However, if the Starman's effect is applied to the character, the object is knocked out just like any other enemy when run into. It is worth no points.
- Stratton, Bryan (June 8, 2001). Super Mario Advance Prima's Official Strategy Guide. Page 55. "Inside the pipe are two plants. The left one is a Small Vegetable; the right one is a POW Block. There is also a bouncing blade in the right corner; don’t hit it."
- Arnold, J. Douglas, James Yamada, and Mark Elies (June 4, 2001). Super Mario Advance Official Perfect Guide. Page 60. "Inside the Jar is a POW and a small vegetable, but beware of a spike creature on the bottom-right side of the Jar."
- FramePlay - Media Conservatory (March 16, 2018). Super Mario Advance EASTER EGG? Blob Castle on World 5-2. YouTube. Retrieved November 15, 2019.
- aeroburger (September 23, 2020). Killing the "Bouncing blade" in Super Mario Advance. YouTube. Retrieved September 23, 2020.