The Fishs are encountered exclusively in Spring Stadium Zone and Gene Gadget Zone. In gameplay, they float back and forth along a fixed diagonal line. They will periodically puff up (extending their spikes) and then deflate.
These Badniks can easily be destroyed with a Spin Jump while they deflated; otherwise, Sonic will take damage when he touches their spikes. In Gene Gadget Zone, it should be noted that the Fishs have a tendency to hover above electrified floors, preventing the player from simply standing underneath them and waiting until it is safe to attack.
Upon their destruction, the Fishs release their respective power source, a purple Flicky, which can be picked up by Sonic.
- This Badnik was given no official name upon or after the release of Sonic 3D Blast. However, its name was revealed in the Debug Mode for the unofficial Sonic 3D Blast: Director's Cut video game developed by Jon Burton, the lead programmer of the Genesis version of Sonic 3D Blast. When asked about its validity, Burton that this Badnik's name was used in the original game.