The game is painfully simple. Watch the angle guide and when it's in the right place, tap. Then watch the power guide and when you think it's the right amount, tap again. If you got it right, the ball sail safely into the hole and you'll move onto the next level.
More often than not, though, you'll miss by a country mile :) It's strangely compelling. Some levels feel far more brutal than others and there's some truly weird ball physics at the extremes of the guides. But, it's great fun to play, especially now it's on Facebook Instant Games.