Extremely buggy and frustrating. Arenas can be straightforward, if repetitive, or ridiculously difficult depending on time you play, regardless of multiplier or the arena you're in. It will lag for 10 seconds at a time during which the game destroys you, or it will stop obeying presses or move by itself to kill u. Opponents can turn God-like all of a sudden, virtually unkillable in the middle of a quest, while the ultimate boss is 100x easier to face. Makes it not fun, and its made me paranoid.