A free program for Android, by UNBALANCE Corporation.

CrazyStone is the best Go app in the world based on Deep Learning technology. It has achieved a 5d in kgs rating and is one of the highest-rated apps in the world. The app has 17 levels for all board sizes, and the highest level is 5d, the same as the rating of the game.

CrazyStone has improved not only in strength but also in the style of play, and the lower levels are perfect for players who want to learn the game of Go. The app is completely free to use and has no ads or in-app purchases, which makes it ideal for players who are looking to improve their skills in this board game.