What is the one feature, mechanic, or design feature that you think is essential to a great solo rpg?
Maybe it is not used enough and should be used more?
Maybe not many people are aware of it?
I think of everything from the 2d6/d66 (36 possibilities), clocks and timers, push-your-luck, journaling or not, simple ruleset versus comprehensive, just d6s versus classic polyhedral dice, etc. I'd really like to hear some great opinions, and maybe we can share some forgotten or lost mechanics.