I agree with AlanH.
His names for game class (level) represent exactly what they must:
Adventurer - this game play usually novices. Those, who want to try something new, also they are training their skills for future famous battles.
Challenger - people, who play this games, feel that they are enough trained and they are real ready to compete with each other.
Predator - you must be a real predator to play successfully on this level.
I vote for these names with my both hands!
His names for game class (level) represent exactly what they must:
Adventurer - this game play usually novices. Those, who want to try something new, also they are training their skills for future famous battles.
Challenger - people, who play this games, feel that they are enough trained and they are real ready to compete with each other.
Predator - you must be a real predator to play successfully on this level.

I vote for these names with my both hands!