An object sits on a board. Drag to slice it, and the cut is rendered properly — you see the cross-section, the pieces separate, the sound lands. Then a new object appears.

There is nothing to solve and nothing to lose. What carries it is the quality of the cutting: different materials resist differently, and the interior of each object is modelled rather than faked.

Where a small amount of skill appears: slicing at an angle produces more interesting cross-sections than straight down, and some objects only reveal what is inside if you cut them a particular way.

The most passive thing on this site. Included for exactly the moments when that is what you are after.