Make your brain
love the hard part.
Fast, focused cognitive workouts for working memory, mental math, attention and reaction speed. Built on established tasks and tuned to keep you at the edge of your ability.
Choose your workout
Each targets a different system. None takes longer than five minutes.
Three steps. Five minutes. Daily.
Pick a game
Choose working memory, mental math or reflex. Start with Dual N-Back if you are not sure.
Train at your edge
Difficulty moves with you. The game sits just past comfortable, which is where the work actually happens.
Watch the number move
Every session is recorded. Your level over weeks is the only progress report that means anything.
Why this is built the way it is
Real tasks, not lookalikes
Every game here is a browser version of something from the literature — the Corsi block test, the PASAT, Donders' reaction task. Not an invented puzzle with a science-sounding name.
Difficulty that adapts
Training works near the edge of what you can do. Levels move up when you clear them and back down when you don't, so the challenge stays calibrated instead of drifting into boring or impossible.
Short, daily, repeatable
The research protocols used brief daily blocks, not long occasional sessions. Every game here is built to finish in three to five minutes.
Honest about the evidence
Training reliably improves the trained task. Whether that transfers to general intelligence is still argued over. Each game page cites what it is based on so you can judge for yourself.
Questions people actually ask
Does brain training actually work?
It reliably makes you better at the task you train. Broader transfer — to intelligence, memory in daily life, work performance — is genuinely contested, with strong studies on both sides. We cite the source behind each game rather than promising outcomes.
How long until I see results?
Most people move up a level or two within the first week of daily play. That is the trained skill improving. Anything beyond that takes months of consistency and is harder to measure.
Is HumanCalc free?
Yes, every game is free. No subscription, no trial, no paywalled levels.
Do I need an account?
No. Play anything without signing up. An account only adds saved progress across devices, XP, streaks and the leaderboard.
How often does the leaderboard reset?
Every Monday at 00:00 UTC. A seven-day season rewards consistent training without becoming a permanent grind.
Pick a game and start.
No account, no download, no trial. Your first session is running in about ten seconds.
Choose a game