Heat Arms (ヒートアームズ?) is a mini-boss from Sonic & Knuckles, as well as its locked-on form, Sonic the Hedgehog 3 & Knuckles. It is encountered in the first act of Lava Reef Zone.


To start the battle, Heat Arms raises a pair of large antennae. Both antennae shower the screen with shots, then lower to make way for a giant hand. The hand follows the player's movements for a while before trying to crush him/her. This process repeats until the giant hand is destroyed, which takes six hits.

If the antennae are hit four times each, they are destroyed, so only the hand can attack. The shots fired by the antennae can be deflected by a shield.


  • The hand portion of Heat Arms resembles the hands of Kyodai Eggman Robo.
  • The antennae make a reappearance during the boss battle against Dr. Eggman in Sonic Mania's Oil Ocean Zone, where they appear when Eggman's submarine surfaces. They function and are destroyed in the same way as they are in Sonic & Knuckles.

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