Go (game)
Two players, "Black" and "White", take turns placing a "stone" (game piece) of their own color on a vacant "point" (intersection) of the grid on a Go board. Black plays first. If there is a large difference in skill between the players, the weaker player typically uses Black and is allowed to place two or more stones on the board to compensate for the difference (see Go handicaps). The official grid comprises 19×19 lines, though the rules can be applied to any grid size. 13×13 and 9×9 boards are popular choices to teach beginners, or for playing quick games. Once placed, a stone may not be moved to a different point.
Pokémon Go
Although the game is free to play, it supports in-app purchases, where players can purchase additional Poké Balls and other in-game items. These items include Incense (which attract Pokémon to you as you move for thirty minutes), Lure Modules, to attract Pokémon to a fixed location, and Lucky Eggs, which double experience points gained for a thirty-minute period from use. All Pokémon are displayed with a Combat Power. A Pokémon's Combat Power is a rough measure of how powerful that Pokémon is in battle. Generally, as players level up, they catch Pokémon with higher CP.