(added floortrap) Marbles go to a random position and jump. if they touch the block when they go up they are eliminated. if they don't, they may continue. they also have a chance (to be accurate. a 20% or 1/5 chance) to refuse to jump. s to show placements. h to hide placements, there are 30 contestants. also, tts says 9th as 9 t h so that's interesting don't press space.
