Tough Guy (Fallout Tactics)

Tough Guy is an optional gameplay mode in Fallout Tactics which makes the game much more challenging. It disables the ability to save while on a mission or random encounter, so the Warrior can only save the game while in a Brotherhood bunker. However, it gives a 100% XP bonus (30% in any version prior to 1.27). Unlike the difficulty level, Tough Guy can only be activated while creating a character (by checking a checkbox on a character creation screen) and cannot be de-activated during the game.

It's also worth noting that the game moves directly from mission 19 to mission 20, allowing Tough Guy players no opportunity for a save. So Tough Guy characters must essentially complete the last two missions without saving.