|Fast Facts on Heavy King|
The Heavy King is the tenth major boss fought in Sonic Mania when playing as Knuckles, and is encountered at the end of Lava Reef Zone Act 2. He is the leader of the Hard-Boiled Heavies, and commands his elite troop with a watchful eye and a powerful scepter.
On reaching the boss arena - the same Master Emerald shrine seen in Sonic & Knuckles' Hidden Palace Zone (Sonic & Knuckles) - the Heavy King attempts to steal the Master Emerald for himself using the same claw-arm machine which excavated the Phantom Ruby at the start of the game. However, Knuckles remembers Dr. Eggman's previous successful attempt, and this time manages to successfully stop the Emerald from being stolen before engaging in battle with the Heavy King himself.
Similar to Super Mecha Sonic, the Heavy King will jump atop the Master Emerald and absorb its power, after which he will hover around the shrine and unleash one of three attacks from his scepter:
After attacking, the Heavy King will retreat to the Master Emerald to recharge for another attack, allowing the player a chance to land some hits on him. He can also be attacked while he's hovering in the air after charging energy. Eight hits will defeat the Heavy King, after which he'll escape, riding the claw-arm machine out of the arena.