No law prevents a convicted felon from running or winning the office of the presidency. As for the question of self-pardons, that’s something that everyone on both sides would hotly debate as it’s never been tested before. You would think there’s an obvious answer (he can’t) but unfortunately laws get fuzzy at the very top and decisions are usually dictated by historic precedent (which there is none for this scenario in US politics.)
The new Monkey Ball game is pretty good for this. Each world is split into 10 levels you can knock out anywhere between 10-30 minutes depending on the difficulty and the challenges you are trying to clear. Since there’s 200 levels that’s 20 separate sessions if you strictly play the singleplayer mode.