Cool Math Run 3 — [verified]

So, if you have a few minutes (or a few hours), head over to Cool Math Games. The tunnel is waiting. Just remember: in space, down is relative.

is widely considered the most popular game on the platform. It’s a massive step up from its predecessors, featuring over 300 levels, a cast of unlockable characters, and a surprisingly deep storyline. Why We’re Still Obsessed with Run 3

But then the tunnels start to crumble. Holes appear in the floor. Suddenly, you are running on the ceiling to avoid a gap, only to realize you need to jump back to the "floor" to hit a launch pad. The difficulty curve is masterful. It’s hard enough to make you restart a level five times, but easy enough to control that you know it’s your fault you fell—not the game’s.