Here's a question. First, obviously it would be unfair and unfun to present the player with a risky situation when they are unprepared or uninformed. So, for the purpose of this discussion, let's assume that the player has been given sufficient warning and clarity that the situation - whether it be an encounter, a puzzle, or a dungeon - carries some kind of risk. With that said, how much do you think it's appropriate to offer the player a situation - whether it be an encounter, a puzzle, or a dungeon - that carries both risk and reward. The reward would obviously be some kind of special item or skill or exp or unlocking a secret area or something in the story - but what can be the risk? Is there ever any kind of risk you can appropriately give the player other than a "game over, reload your last save file" ? If so, what could it be?