The Swing’m Spikez (ツインハンマー Tsuin Hanmā?, lit. "Twin Hammer") is a sub-boss that appears in Sonic the Hedgehog 3. It is encountered in the end of Launch Base Zone Act 1 and takes six hits to be defeated. When playing as Sonic and/or Tails the player faces a single Swing’m Spikez, but when playing as Knuckles, the player will face twin Swing’m Spikez. Swing’m Spikez are circular robots created by Dr. Robotnik, which have two swinging spiked balls as its main weapons, which are attached with two smaller balls. The three known ones were stored in yellow metallic crates in the Launch Base Zone.