Topologo app for iPhone and iPad

It’s a design tool. It’s a construction toy. Maybe it’s a puzzle. Topologo is sort of like playing with really great blocks. The blocks are hexagons, and have various path designs on them, so by placing the blocks you create patterns. Simple, yes, but the possibilities are sort of incredible. You can make designs that are organized or random, simple or intricate and complex, in colors from subtle to pop. Every knotting, weaving, braiding, knitting pattern can be constructed. The experience is entirely open-ended — the patterns you make, the challenges you set and rewards you find are uniquely your own.