Construct a 
cube from thirteen 
blocks, one 
block, one 
,
and three 
blocks.
Conway Puzzle
See also
Box-Packing Theorem, Cube Dissection, de Bruijn's Theorem, Klarner's Theorem, Polycube, Slothouber-Graatsma PuzzleExplore with Wolfram|Alpha
References
Honsberger, R. Mathematical Gems II. Washington, DC: Math. Assoc. Amer., pp. 77-80, 1976.Referenced on Wolfram|Alpha
Conway PuzzleCite this as:
Weisstein, Eric W. "Conway Puzzle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ConwayPuzzle.html