Click and drag across the rope on desktop, or swipe across it on a touchscreen. The object hanging from it then falls and bounces off the pegs below.

The deflector pegs change an object's path as it falls, so objects rarely drop straight down. Reading the peg layout and predicting the bounce before cutting is the main skill in the game.

Yes. Falling objects collide with each other and with objects already resting on the board, so releasing them in the wrong order can send both astray. Most levels are a single ordered sequence rather than several independent drops.

Yes, Undo is available, along with Hint and Reset. Since a badly-placed object changes the board in ways further cuts cannot fix, resetting is often the cleanest option.