Here's a puzzle for the upcoming — as of the time of posting — pi day celebrations.

Slide the blocks around without flipping them to rearrange them from the letter pi into a square.

DXF and SVG EasyAsPiPuzzle files are available for laser cutting.

SVF and PNG PiShape files are available to print to arrange the tiles on in the pi shape and the square shape.

This puzzle was created by Stephen Froggatt and is posted at MathIsFun

This is a customizer; you can change the thickness and size of the tiles.