0stars
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One move: tap a tile to turn it. Keep turning until no pipe is left pointing at nothing.
A pipe end with nothing on the other side is drawn amber. One that meets another pipe turns blue. You never have to hunt for what is still wrong — the board is already telling you.
Tiles never move, never swap and never leave the board. Every tap turns one a quarter turn clockwise — that is the whole game.
The moment the last end finds a partner the whole board goes green at once. There is nothing to check and nothing to submit — you will see it happen.