Levels 1-5 are free. Levels 6-30 need a $3 licence key.
What the key unlocks
25 more levels, numbered 6 to 30, with the same rules as the free ones. The boards grow from 7x7 to 10x10 and hold 3 to 6 gems each. The shortest solution grows from 8 to 20 moves, and it never gets shorter from one level to the next.
The 5 free levels are smaller: boards of 5x5 and 6x6 with 1 to 3 gems, and a shortest solution of 3 to 7 moves.
Every level was generated by a program and solved by the game's own solver script, so each one has a solution and the par shown in the game is the smallest number of moves.
Buy the licence key
The licence key is sold on Gumroad for $3. Gumroad shows the key after the purchase and on your receipt.
Buy the $3 licence key on Gumroad
Refunds and support go through Gumroad: use the contact link on your Gumroad receipt. Refunds follow Gumroad's refund policy.
Enter your licence key
How the key works
When you press Unlock, this site sends the key to Gumroad to check that it belongs to a purchase that was not refunded. If it does, the 25 levels are downloaded and stored in this browser, and the game shows them from then on.
The key itself is not stored in your browser. On another device, or after clearing this site's data in your browser, enter the key again.