Thanks for the comment! You are correct that no two landers ever reach the end of the column at the same time. This is based (as faithfully as I could make it) on an old Nintendo handheld game called Parachute. In the original, the action starts slow and speeds up so you have a chance to learn the quirks of the game before it becomes ridiculously fast. In 20 seconds, that’s not possible so I tried for a fixed speed that would be challenging but achievable with a little practice. I may get around to implementing the full version when other projects permit it.