Can you complete a Rubik’s Cube in record time? Do you laugh in the face of 2,000-piece puzzles? The Thinker Box is for masters, meaning this is not your grandpa’s puzzle box (or maybe it is - if he was a savage puzzler). These groups of puzzles are level 4-5 (out of 5) challenges made for the most committed players, chosen from Kubiya Game’s most popular wooden mechanical puzzles. Let it be known: the difficulty is not exaggerated. At all. Brace yourself for some invigorating, deliciously maddening, head-scratching puzzles!