Sling

pull back, let go. knock down the plate with your number.

a fairground catapult gallery: sling numbered pellets at the matching tin plates as the belts speed up, level by level

A catapult takes one instruction, all at once: the direction and stretch at the moment you let go. Nothing steers the pellet after that, so once the belt moves you aim where your plate will be, not where it is. Each level adds one thing: a moving belt, a faster one, two belts, wind, smaller plates, glass bulbs to spare.

Concepts: gravity, trajectory, momentum.

An interactive you play with one thumb, on Wundr.