Mission Carom ball

Carom billiards — no pockets, three balls, points for striking both objects with the cue ball. The rule fits in a sentence, which is why the game is a good demonstration of how much depth sits behind a simple one: spin, contact thickness and power all have to be judged together, and none of them forgive approximation. Forty missions set specific tasks, with a freestyle table for working on a shot that keeps failing.