I feel obligated to make a short clarification on
Gomoku to state that it's not a simpler version of Go, it's an entirely different game that just uses the same equipment as Go does. "Gomoku Narabe" literally means "Line up five", and that's the goal of the game: players alternate placing stones of their color, seeking to be the first to get five of their stones in a row (including diagonally). There's a few additional rules that are frequently put in place in order to reduce the first player's advantage, but that's the basic gist of it. It's a good, classic game, and a part of the Clubhouse Games collection on Switch.