Made to control Chaos, the Anti-Chaos Nullifier is a cylinder-shaped, grey metallic device.
After discovering Chaos, Dr. Robotnik would develop the Anti-Chaos Nullifier to control the destructive beast. After some test though, Robotnik concluded the device would not work.
Years later, Robotnik's assistant, Grimer Wormtongue, found the Anti-Chaos Nullifier. Learning of it, he released Chaos, intending for the monster to destroy Robotnik's enemies before using the Anti-Chaos Nullifier to control it. However, when he explained this to Robotnik, the madman smashed the device, explaining that it did not work.