It depends, on standard consumer units, it's just like putting a plastic ice cube tray into the freezer, once it's frozen the ice drops down a chute to break it into individual cubes.
For commercial versions (where more volume is needed), they will build up layers by misting a low temp tray with water. That way it has less mass to bring down to the freezing point at a time.
Slay the Spire right now. Just mindless enough that I don't have to think too hard, but also engaging enough that I don't think about being sick.
Otherwise I'd go with Link to the Past.