Mahjong Time

Same tile-matching rules as any mahjong solitaire — clear the board by pairing up identical, currently-exposed tiles — but with a clock running in the background that changes the whole feel of it. That added pressure means the patient, no-rush approach that works in regular mahjong solitaire can actually cost you here, so it's worth scanning the board fast rather than overthinking each move. Anyone who already knows mahjong solitaire can jump in without relearning anything.