Melting Block is a puzzle designed and made by William Waite.
The puzzle comes with eleven pieces within the frame with one extra small block. The aim is to fit this extra block within the frame, it looks impossible at first but it can be done!
Handmade in the US from Red Alder and Black Walnut. The frame measures 13 x 11cm.
There are actually 159 possible solutions for fitting the 11 pieces within the frame. There are actually even more ways of fitting all 12 in but finding even one can be a challenge!