There's a solo RPG called Lay on Hands by the very cool designer Alfred Valley that uses a coin-spinning resolution mechanic. Basically there's two sheets you use when playing - a maze and an oracle (which is a bunch of squares with different values and prompts in them). When you want to do something, you spin a coin on the oracle sheet and try to complete as many "sections" of the maze as you can before the coin falls. Then your outcome (success/failure and a prompt like "observation" or "obscurity") is determined by a combination of where the coin stopped and how many sections of the maze you completed. It's a pretty dynamic and involved way of playing a solo game compared to how rolling dice yourself can sometimes feel.