Pupils enjoy Pyraminx fun

Children showcase their Pyraminx cubes at Hengchangdianxiang Primary School, Yuquan district in Hohhot on Sept 12, 2017. The Pyraminx is a regular tetrahedron puzzle in the style of a Rubik’s Cube. First conceived in 1970, it was patented by Uwe Mèffert after the original three layered Rubik’s Cube by Erno Rubik, and was introduced by Tomy Toys of Japan in 1981. [Photo/Xinhua]