This category in the main scale refers to bug checks, optimization etc. You can still get a full point here if your game chugs along at the end of a run (that’s just slowdown! it’s a feature, not a bug!) But if there are game breaking bugs, major issues, a game might get a bad score here. This helps us weed out shovelware and unfinished attempts – after all, if a game doesn’t work at all can it really be said to be exactly like Vampire Survivors?