- "The Floor is Lava" mode in Assassin's Creed 2. If you touch the ground for any non-necessary reason, you need to aggro a guard into killing you.
- Going through GTA IV without cheats or autosaves, with permadeath. If you die, delete your save and start over.
- Not buying anything with cash in Far Cry 3. All weapons, medicine, and kevlar must be found in your travels. Makes you feel like a real survivalist, especially at the harder difficulties.
There's more that I've picked up, but none come to my head right now.
- Going through GTA IV without cheats or autosaves, with permadeath. If you die, delete your save and start over.
- Not buying anything with cash in Far Cry 3. All weapons, medicine, and kevlar must be found in your travels. Makes you feel like a real survivalist, especially at the harder difficulties.
There's more that I've picked up, but none come to my head right now.