I had a flash yesterday on how to implement a solitaire racing game.
The first solution would be a kind of beat your time mechanism like rally man. But it's not that interesting.
The second solution would be to have a mix of super off road and Stunts PC game where you have a racing track with various stunts that you need to perform. The goal is to survive. Reach the end of the track without crashing.
There would be some metrics to keep track every turn like speed, grip, damage to the car, etc. The idea is to make sure the same stunt will not get cough at the same speed, control, etc. Where could be water that wet your tire changing how you car behave on the road.
Else I was thinking of using arena maximum card system, or something similar, to prevent optimal solutions and to have a replay-ability value of the same track. I would give each card 2 purpose to get a more interesting strategy.