I also had performance issues in Firefox, so I tried something else: just holding the up key. It was surprisingly effective. Not that it didn't fail a lot, but it progressed through the levels at a fairly even pace. Unless I misunderstand the maths, the hold-up strategy has the same probability of winning regardless of which level one is at, since the levels only increase the speed of the obstacles and not their dens…
> the levels only increase the speed of the obstacles and not their density. But your speed is the same at every level. Instead of looking at the width of each obstacle, instead look at the amount of space that the obstacle covers during the time you are in its path. If it moves faster then it covers more space during the time it takes you to cross, so it is effectively wider. Imagine if the obstacles moved so fast t…
Edit: actually thanks to their double thickness it does matter! I didn't think of that.