Progressive blindfold chess training from square recognition to full games
Call the plays in real NFL late-game situations
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
27 different play calls including runs, passes, RPOs, trick plays and Hail Mary
Real NFL situations with actual score, clock, down and field position
Library of 160,141 real NFL plays from 2022-2026 seasons
Grading based on win chance simulation
Daily challenge with same scenario for all players
Survivor mode with sequential late-game situations
Player ratings by position from real NFL production
Comparison with NFL coaches through percentile scoring
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
Real situations from actual NFL games, not invented scenarios
Grading on decision quality via win-chance simulation, not just outcome
Every snap uses real NFL plays from historical data
Comparison with actual NFL coaching patterns and styles
Built on public nflverse data with transparent sourcing
DarkSquares
Two-Minute Drill