URN · Edge matching

Match digits across every edge shared by two tiles. Tap a highlighted tile to flip it into the blank. Each tile carries the same three edge digits on both faces; the digits travel with their physical edges.

Outside edges and edges next to the blank are unrestricted. Any arrangement with all occupied shared edges matching wins, regardless of tile IDs, face, or blank location. Blue and amber show front and back. Red marks show mismatches; gold outlines show legal moves.

Every puzzle starts from a matching arrangement and is shuffled with 100 legal moves, so a solution is reachable. Restart restores your latest shuffle. Show solution reveals the generating arrangement; New digits creates a fresh set.