After completing a level, when restarting that level the player will see two ghost objects moving through the level, their best time/path is the ghost with a white trail and a player which is ranked 2 spots above them will show with a blue trail. This lets the player see potentially better paths to improve their time until they potentially get to the #1 rank in which case they will only see their own best path.
I chose to include a player 2 ranked spots above the current arbitrarily, once the boards get more populated I can refine this to choose based on maybe half the previous rank(a harder challenge) as well as 2 spots above(an easier challenge).