Six Doors by Yavuz Demirhan is a variation on the classic six-piece burr shape. The added rings around the endgrain resemble a stile and rail door once the puzzle is assembled. Each ring complicates the movement of the pieces to reach a formidable but approachable level 14 solution.

Yavuz had originally released this design in 2012, and since then has optimized the puzzle to increase the level from 12 to 14 moves to remove the first piece. The simple shaped pieces conceal a tricky dead end that must be discovered and overcome in order to prevent circling back to the assembled shape.