Triangle Cube 3

Designer: Osanori Yamamoto

This puzzle measures: 55 mm x 55 mm x 55 mm

Material: Honduran Mahogany and Acacia

Kevin Sadler wrote about it:

“Triangle Cube 3 looked to be the significantly easier of the two Osanori releases (silly boy!) the pieces were generally smaller and there were 2 triangular openings on either side of the box. Again, a 3x3x3 cube shape is required but this time only a small triangular face needs to be filled diagonally opposite each other. Burrtools gives a horrific number of 275 possible cube assemblies to make this conformation! That might be a very long challenge! My initial plan of systematically finding possible assemblies before failing to insert them in the box quickly proved to be ridiculous. There had to be a better approach – I don't like too much random trial and error. I should have realised straight away that this is not a feature of Osanori's puzzles – he always ensures that they are solved mostly by thought. A proper look at all the pieces shows that there is a huge restriction on how they could possibly be assembled (Think¬© about it). Once I had realised this I tried some more careful 'out of the box' assemblies. It was still pretty tough but all of a sudden there was a wonderful Aha! moment. Yes! Again, with a wonderful sequence (level 7.4.2.3.2) I had my puzzle solved – at least it would be theoretically possible except for one problem… a quick e-mail to Jakub and I was informed that a rotational move was definitely needed. That is VERY clever – the last part of the assembly can be done just by rotating the puzzle in your hands and allowing gravity to move the pieces into place. I love it – one of the best and most logical puzzles I have solved in a while.”