I've only ever experienced 1 bug in the game. Ever. Story wise, eh, endings should be a bit easier to find.
"Please note: Internet connection is required to access Escalation missions, Elusive Targets or user-created Contracts. Story and bonus missions can be played offline." This and all progression, which is the point of the game. Do not buy.
Pretty hard though. Be prepared to think, and not just run through expecting the best.
