Uploaded November 2025 | Updated September 2026, 2 days ago

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In this video, I take on the 125Y Puzzle, aka the 25Y or Pentomino Cube 125 Y — a fascinating 5×5×5 wooden cube built from 25 identical Y-pentacubes.

Although the pieces look like little “T” blocks at first glance, they are officially classified as Y-pentacubes, which makes this puzzle both mathematically elegant and surprisingly challenging.

Watch as I break down the geometry of the Y-pentacube, show how the pieces interlock in 3D space, and attempt to assemble the full cube. Whether you’re into mechanical puzzles, wooden brain teasers, or pentacube construction, the 125Y Puzzle is a beautiful example of mathematical design in woodworking.

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0:00 Unboxing
0:36 The pieces
1:42 Solution

#125Ypuzzle
#Pentomino Cube
#woodenpuzzle
#mechanicalpuzzle
#pentacube
#brainteaser
#puzzlesolving