Crazy Stone – Test your skills with serious games against the AI

[Game] Crazy Stone – DeepLearning

Crazy Stone  The strongest, the best Go app in the world based on Crazy Stone employing Deep Learning technology !

New Features!!
Online Games against Go players all over the world
IAGA Rating Certification Tests
Challenge the Dan/Kyu tests provided by the International AI Go Association.
Premium Membership
Completely ad free, higher levels and additional features for Premium Members.

Crazy Stone has made a huge step forward by combining Deep Neural Networks with Monte Carlo Tree Search. The highest level of Crazy Stone Deep Learning has achieved 5d in kgs rating and in this lite version, we have provided you the highest level of 2d for FREE!

17 levels of play from 15k to 2d
There are 17 levels of play (15k-2d) for all the board sizes. Crazy Stone has improved not only in strength, but also in his style of play and the lower levels are perfect for players who want to learn the game of Go.
Now, the strongest level for Premium Members is 5d.

IAGA Rating Certification Test
Challenge the Dan/Kyu tests provided by the International AI Go Association. You will be awarded certificate images if you pass the tests.
(You will need to register an AI Game Account to challenge the tests. Registration is free)

Export and import sgf game files
You will be able to import and export game records in sgf format from other apps. Also you can copy game record data to the clipboard.

Rating Mode
Test your skills with serious games against the AI, keeps track of the results of your games and the history of your rating!
The Rating Mode will be partly unlocked if you reach 7k IAGA Rating. If you become a premium member, all of the Rating Mode features will be unlocked immediately.

Other features
Friendly 3 input methods

You can choose from 3 options of input methods (Zoom, Cursor & Touch).

17 levels of play for each board size (9×9, 13×13, 19×19)
Human vs Computer, Human vs Human (sharing a single device)
Computer vs Computer Games
Handicap games, variable options of Komi
Hint (suggest)
Instant Undo (available even when the computer is thinking)
Automatic territory calculation
Japanese/Chinese Rules
Suspend/Re-start games
Save/Load game record in sgf files
Automatic and manual replay of a game record
Highlight the last move
COM resign feature
Byoyomi games
(You will not be able to select computer level in timed games)
Atari warning
Highlight the last move
Play speed can be adjusted

*Notes for Premium Member (Monthly Subscription)
The benefits of Premium Members are:
Completely ad free
Maximum AI playing strength will rise to 5dan
Play Rating Mode for all 3 board sizes
Challenge the IAGA Certification Tests higher than 7kyu

The Premium Membership is a montly subscription service.
The Subscription will be renewed automatically unless cancelled more than 24 hours before the end of its current period.
To turn-off the auto renewal of subscription, please open the Google Play Store app and change your Google Play Account settings.
You will not be able to cancel the current subscription during its active period.

* This app is certified by International AI Go Association

Crazy Stone user reviews :

Pretty good all in all. But it has these weird Sudoku adverts sometimes that are like a puzzle to find how to close. I hate manipulative advertising and this is particularly obnoxious. Edit: it’s got better again… cautiously increasing to 3 stars. (Without bad ads the game merits 4 or 5 stars)

It’s a really solid app, the main complaint I have is that on my OnePlus 7 Pro, there’s a lot of black space at the top, so the app doesn’t take up all the screen space vertically. That’s a bit annoying, but besides for that really nice job!

There should be a mid-game win rule. I have won more than 70 points, and your 2d program is still not giving up. It is too time consuming to be entangled in the end.

Unbelievable such a good app for free! One is really tempted to step up to the non-free one!

There are apps with ads and then there are ads with apps, and this is close to the latter. When you do play, whilst it’s quite good the computer doesn’t finish the game when it’s clearly at an end, but persists and drags it out.

I’m new to playing go, and downloaded one other app before this one so my five-star recommendation is not based on a large amount of experience, but this game interface is simple and clean, and I’m enjoying using the hint feature to help me learn.

Playing 9×9 the AI is more like a puzzle. Once I figure out the right moves I can play the same moves and the AI will respond in the same way. However, the harder the AI the more variations, but still possible to predict its moves. The paid for version fixes this. I would like to see when editing the game for it to just add a variation to the board or at least rewrite the sgf. Right now if I edit the board, when replaying the game it only goes back to place I started editing. Thanks.

Contact developer :


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