White tiles are available. Pick two with the same face to clear them. A tile with something on top, or boxed in on both sides, cannot be taken.
Keyboard: Tab moves between tiles / Enter or Space picks
Clear a stack of 84 tiles by taking matching pairs. A tile can be taken only when nothing sits on top of it and one of its sides is open. Every deal here can be cleared to the last tile.
Questions
Do I need an account?
No. Opening the page is the whole setup.
Is every deal really solvable?
Yes. The removal order is chosen first and faces are assigned to those pairs, so a path to the last tile always exists.
Where is my time kept?
In this browser on this device. Nothing is sent to a server, so it does not follow you elsewhere.
Does it work on a phone?
Yes. Press a tile to pick it, then press its match.
Does it work offline?
Yes. Once the page has loaded, it plays through with the network off.
What if I stop halfway?
The board and the clock are kept, and reopening resumes from there.