Plain money is a big motivator in this game. The coins you get from a good flip are very nice.
You just tap to start the flip, and hope for the best.
The only control is a button to press to launch the knife. You use the coins to get new knives.
Most players find that waiting a bit before you tap helps a lot. You should try to get the knife to land perfectly.
Q: What are the controls? A: The only control is a button to press.
Q: What is the objective? A: To get a perfect flip to earn coins.
Q: What stated features exist? A: Not stated.
Q: What is the main mechanic? A: Flipping knives to earn coins.