Every starting board has a solution. The targets, move limits and rules are shown before you begin and stay fixed during your attempt. Progress shows what you have actually completed, not an invented chance of winning.

No entry fee, countdown or purchase is required. Undo works during an active round. You can pause, leave or start over. Your current board resumes in this tab after a refresh. Take a break whenever you like.

These four warm-ups have no cash prizes. Completing one earns a completion result only. The separate Unsolved Room offers a £1,000 starting bounty, with £1 per qualifying unsuccessful account and a £5,000 cap. It has no scheduled closing date. No warm-up or practice move increases that prize. See its live status and eligibility rules before entering.

Choose “Solve together / Watch” inside any room to create a live shared board. Send a co-op invitation to solve together, or a watch invitation for a read-only view. Anyone with a co-op link can move and undo; only the creator can restart or end the room. Invitations expire after 24 hours. “Challenge a friend” still shares a separate copy of the same starting board.

Use “Report this board” inside a challenge to copy its version, board code and move history. Send that report through Duemello support. A technical error is never presented as a completed or verified result.