Tough Guy (Fallout Tactics)

Tough Guy is an optional gameplay mode in Fallout Tactics which makes the game much more challenging. It disables saving 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, disallowing Tough Guy players an opportunity to save. So Tough Guy characters must essentially complete the last two missions without saving.