Ely Go

ElyGo is a complete Go game application for enthusiasts.

Features :

• 500+ built-in Tsumego problems with answers as well as bad variations
• Play against a bot (GnuGo 3.8)
• Play and observe games online on IGS
• A database of 20,000 Pro games
• SGF Editor to review and edit games
• Loads Kogo's Joseki Dictionary
• A challenge mode where you have to solve a set of problems in a limited time
• Import your own game database
• Comes with 3 visual board themes
• 3 different ways to play stones on the board
• Automatically loads .sgf files opened from another apps (like a web browser)
• Prevent device standby while playing or observing games (this can be disabled)
• Automatically zoom and rotate problems to use the maximum space on the screen (customizable)
• You can review your own game collection (like commented pro games) very easily
• You can choose your color in problems (black, white, or random) and change several other settings

https://play.google.com/store/apps/details?id=lrstudios.games.ego

If you would like to see any other features, just tell me and we can discuss it. You can find me on KGS (LadaRaider?).