1) Tiling puzzle 
Ostomachion, also known as loculus Archimedius (Archimedes` box in Latin) and also as syntomachion, is a mathematical treatise attributed to Archimedes. This work has survived fragmentarily in an Arabic version and in a copy of the original ancient Greek text made in Byzantine times. The word Ostomachion has as its roots in the Greek Ὀστομ