You do two runs of the same simple platformer game.
- One where you are just playing some character and try to get as far as possible.
- Then, it replays what you just did, and it’s your job to stop/kill your old self as soon as possible. (Maybe the replay is sped-up, to make it harder!)
There must be an incentive to do the first run as good as possible. Perhaps, you only get good traps/actions in the second run, if you grab them during the first? (And the score is higher.)
In the second run, you need incentive to really kill yourself soon. A good idea = Your score counts down from the moment the second run starts.
The challenge is of course: remembering how you moved in certain sections. And using whatever you have, in whatever order it’s given, to stop that.