Go has gone more than 2,500 years without needing any updates: two players, black and white stones, and a grid-like board. Whoever surrounds more territory wins. The rules fit in a paragraph; strategic depth is another story. Here you will find versions of classic Go —with adjustable AI, tsumego, and online matches— as well as Gomoku, the five-in-a-row game that shares the board and pieces but has its own rules. Everything from the comfort of your phone.