Peter’s Non-flipping Tri-Cairos (IPP25) by Peter Knoppers / Buttonius Puzzles

Peter’s Non-flipping Tri-Cairos (IPP25) by  Peter Knoppers / Buttonius Puzzles

WOW!  Tri-cairos are a specialty sort of pentomino, where each unit is comprised of a pentangle (rather than a square) with equilateral sides and two non-adjacent right angles.  Creating a domino from three units is called a Tri-Cairo.  There are eight possible non-flipping tri-cairos, and this puzzle present all with two bonus mono-cairos to pack it all into a cool tray puzzle with MANY different challenges depending on where the Tri-Cairo key piece(s) are constrained.  Detailed instructions included.  Designed and exchanged by Peter at IPP 25 in Helsinki.

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