'Split' 1x2x3

thingiverse

Puzzle makers can cut a standard 1x2x3 in half across both the top and bottom layers, allowing 90-degree and 270-degree turns, as well as 180- and 360-degree turns on these two halves. This unique twist creates a 2x2x3 configuration along its middle layer in two distinct areas, significantly increasing the puzzle's difficulty beyond what is expected from a standard 1x2x3 or even a simpler 2x2x3 design.