Dozo is a traditional pattern-making board game for 2 or 3 players from Japan.

Description provided by NewVenture Games on YouTube:

In the Japanese board game Dozo, each player attempts to create a triangle of a single color, but the four colors are not assigned to specific player! Any player may place any colored peg to win. (Dozo is one of my favorite three-player games.) This traditional game is available from us as part of the Peg Pastimes series of historic games from around the world. Click here: https://newventuregames.com/products/dozo/ (Don't look at my hat.) https://www.NewVentureGames.com https://Facebook.com/NewVentureGames See it on BGG: https://boardgamegeek.com/boardgame/8539/dozo