brainGO — A 4×4 Go Puzzle Game for All Ages
A 4×4 Go puzzle game for all ages · a daily brain workout
Play on braingoOne Stone Changes Everything
Same board, add or remove one stone and the outcome flips. A brainGO original — every ±1-stone variation computed, so you can see which stone decides the game. Nothing else like it.
Go, distilled to its purest form
Most people never try Go because 19×19 looks like war. brainGO shrinks the board to 4×4 — sixteen points — where the game becomes pure visual logic: surround a stone, cut off its liberties, capture it. No manual. No score math. You learn by playing the first puzzle.
It is the same idea professional players use to teach young children (the "capture go" / "atari go" tradition): strip away territory and counting, keep only the most satisfying part of Go — capturing stones by reading shapes.
Two minutes a day, for all ages
brainGO is an all-ages daily brain workout — open it and play, whoever you are:
- Kids starting their first logic game — playful pieces, instant feedback, a gentle companion that nudges instead of scolding.
- Adults wanting a two-minute break between tasks — short loops, zero number stress, shareable like Wordle.
- Seniors wanting a calm daily mental exercise — large text, high contrast, one puzzle a day, a companion character that remembers their name. (We say "keep your mind active," not "prevent dementia" — the science on that is still inconclusive.)
A puzzle takes 10–30 seconds. That short feedback loop is the whole point — it is what makes brainGO feel more like a habit than homework.
Why a tiny board is a feature
On a 4×4 board there is no opening theory, no endgame counting — the moment stones touch, it is a close-range fight. That forces you to actually read out liberties and captures, one of the most transferable skills in Go, without ever opening a rulebook.
The board is small enough that every position can be solved perfectly. brainGO's puzzles are generated by an exact solver, so every "winning move" is provably correct — no guessing, no luck.
What it is not
- Not a 19×19 match against an AI.
- Not a gambling or betting tool.
- Not a medical device or a dementia treatment.
It is a calm, honest, capture-puzzle game with a companion — designed so a brand-new player can finish level one in three minutes without reading a single line of instructions.
Start playing
Pick a puzzle and place a stone. The companion will show you the rest.