How much of the position can you hold in your head? The board freezes a few moves back and the moves played since are listed in notation, or the board disappears entirely.
Puzzle rating
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Low on purpose: the tactic should almost never be the thing that beats you here. If you miss one, it should be because you lost track of the position, not because you missed a fork.
How much is hidden
Half-moves hidden from the board, or the whole board for the hardest setting. Eight is the most we hide: beyond that, the hidden moves rarely change the answer.