AFnord says: A complex economics simulator that requires a lot of time and effort from the player.

AFnord says: The commandos series is exceptionally unforgiving. A game for this with a lot of patience and who don't get frustrated easily.

AFnord says: Another very tough game, for those who don't get frustrated easily.

AFnord says: The Gothic series is known for its hardcore RPG-er appeal, and Gothic 2 is by far the most challenging game in the series.

AFnord says: A complex and very accurate flight simulator, often viewed as the current holy grail of flight sims.

AFnord says: With its slightly oddball logic, dead ends and tendency of punishing the player for any mistake that he or she does, the King's Quest series is only for those with a lot of patience.

AFnord says: With a very complex rule system, the Realms of Arkania series demands from the player that he or she commits to the game, before the game gives anything back.

AFnord says: Another World (also known as Out of this world) is an unforgiving game, that will punish you for every little mistake you make. It requires you to play economic with your weapons and think ahead.

AFnord says: A tank simulator, that actually does the whole simulation part. Slow paced and not as action oriented as you might expect a game about tanks fighting each other to be, but for for the enthusiast