How to beat level 72 in 100 floors

In order to solve level 72 of the mobile device game 100 Floors, notice the shapes of each "car," and the number of sides each has.

The number of sides tells you which car should be placed in which position, from first (winner) to last.

The circle has a single side, so drag it all the way to the top, putting it in first place.

The triangle has three sides, so drag it up next, right behind the circle.

The square has four sides, so place it as the third place finisher.

The pentagon has five sides, placing it in the fourth position.

With the hexagon and its 6 sides in last place, the little racers are all in their correct positions; the cars will vanish, and the door will slide open to take you to the next level.

100 Floors currently has 90 levels with what are likely the final 10 levels promised in an update "coming soon."