Throw knives into a rotating log. Don't hit the knives already stuck in it. Apples are bonus targets. How many levels can you clear?
Tap anywhere to throw. The knife flies straight up and sticks into the log if there's nothing in the way. If it hits a knife already stuck in the log, you lose. Apples on the log give bonus points; hitting one destroys it and your knife still sticks. Each level requires more knives, and the log spins faster, sometimes reversing direction without warning.
Time the gaps, not the knives. Beginners watch the planted knives and try to wait for one of them to pass — that's backwards. The thing your incoming knife actually needs is the gap between two planted knives to arrive at the top. So scan for the widest empty arc on the log, predict when its leading edge reaches twelve o'clock, and tap a hair before.
Early knives are free real estate, late knives are landmines. Your first throw of a level always lands. Your second can land almost anywhere a half-turn away. By the time you're throwing the fifth or sixth, the gaps are narrow and you've created the trap yourself. Spread your early knives apart deliberately — opposite sides of the log if you can — so that the late knives have somewhere to go.
Reverses are the killer. The log will sometimes flip direction in the middle of a level. If you've been timing your taps off rhythm, the next tap after a reverse will land exactly where you didn't want it. When you notice a reverse, skip one beat — let yourself re-read the new motion before throwing.
Apples are bait. They're worth points, but they tempt you to throw at a specific angle instead of the angle that's safe. If the apple is in a clean gap, take it. If the apple is bracketed by planted knives, leave it — the bonus is smaller than the cost of restarting from level one.