Arena of Judgement

The Arena of Judgement was, as its name suggested, an arena that the Drakon Empire used as part of its trial-by-combat system, in which the defendant would be forced to battle a Prosecutor to the death.

Sonic was forced to fight a Knuckles Metallix in this arena when he was accused of destroying a Drakon Sentinel (in reality, he had merely been present when the Sentinel self-destructed). With Tails, Sonic managed to defeat the Metallix, and Emperor Ko-Dorr pronounced him innocent despite Robotnik's protests.