Go Game, developed by Tsumego Go Games, is one of the strongest Go/Baduk programs available on Android. The latest version of this free game has an improved top play strength up to 7 dan, using a server.

This program offers full 9x9, 13x13, and 19x19 games, with ten difficulty levels ranging from 18 Kyu to 7 Dan. It is based on an internet server Go engine, and supports Go rules and handicaps.

If you're looking for a challenging Go/Baduk game on your Android device, Go Game is definitely worth trying out. The game is easy to use, and its various difficulty levels make it suitable for both beginners and advanced players.