Progressive blindfold chess training from square recognition to full games
A free memory game inspired by Ayumu the chimpanzee at Kyoto University
Stage
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Founded
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Based in
FR
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Pricing model
Freemium
Free
Pricing
Free: €0 forever with unlimited exercises, games vs AI, and access to levels 1-3. Pro Lifetime: €39 one-time payment for all 7 levels, all 8 AI difficulties, famous games library, endgame training, and intermediate tactics.
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Key features
7 progressive training levels from square colors to full blindfold games
Unlimited exercises and games against AI
Voice-controlled play in 6 languages
Progress tracking and achievement system
Cross-device synchronization
Famous grandmaster games to replay blindfolded
Endgame training module
Multiple board visibility modes
Tactical puzzles and exercises
Progressive levels that add numbered squares
Flash window shrinks as difficulty increases
Three-strike game over system
Local browser storage of scores
Challenge links with shared level difficulty
Customizable flash speed via URL parameter
What makes it different
Systematic progression from fundamentals to blindfold mastery, not just a side effect of puzzle training
Free tier is genuinely free with no dark patterns or engagement manipulation
One-time €39 lifetime payment with no subscription required
Built and maintained by a single indie developer actively improving the product
Available across web, iOS, and Android with unified account
Based on genuine peer-reviewed research from Kyoto University's 2007 Ayumu experiment
No account, no download, no personal data collection
Includes detailed educational articles about the original experiment and memory science
DarkSquares
ChimpTest