Although most of the game modes in Marvel Tōkon: Fighting Souls are available from the start, one of them has a hidden difficulty level. We are talking about the Champion Circuit in the Arena. This is a special circuit with one essential unlock requirement.
The Arena's Champion Circuit features a single route, unlike the four routes with different bosses found in the other circuits. You will fight four teams of characters before finally facing the Champion, the final boss of Story Mode.
To unlock this circuit—and complete it to earn the Champion Buster trophy—you must complete each of the other five circuits available by default at least once. The difficulty and route you choose do not matter; you simply need to clear each of the five circuits once. After doing so, the sixth circuit, the Champion Circuit, will be unlocked. Bear in mind that this circuit is more difficult by default, even if you select Easy mode.
