Roll Under

A roll under mechanic is almost a mirror to the roll over mechanic. It is most commonly used with an ability of the character in which case they must roll lower than their ability to pass.

Games that use a Roll under mechanic

• BESM (well, first two editions did), other tri-Stat system games
• GURPS
• Dark Heresy and all related systems.
• Eclipse Phase
• Warhammer 40000 for Leadership tests and a few other rolls.