A CogDojo session, start to finish
The whole loop is built around one idea: keep the challenge matched to you. That's what makes short, daily practice feel worth coming back to — and what makes the numbers you see afterwards meaningful.
The four-step loop
Pick a skill, play a short game
Each game trains exactly one of six cognitive skills — Memory, Attention, Speed, Flexibility, Problem Solving, or Language. Sessions run two to three minutes, so practice fits between the other things in your day rather than demanding a block of it.
The game reads how you did
When a session ends, CogDojo scores it from how much you completed, how accurate you were, and whether you finished. That score becomes a single signal of how the round actually went — not a vague feeling that it was 'hard' or 'easy'.
Your rating moves
That signal nudges your Elo rating for the skill up or down — the same kind of rating chess and matchmaking systems use. Do better than your rating predicted and it climbs; do worse and it eases back. Over many sessions it settles near your true level.
The next session re-aims
Your updated rating sets the difficulty for next time, so the challenge tracks you. New skills start gently and ramp; skills you're strong at stay demanding. You spend your time in the stretch zone instead of grinding through rounds that are too easy or bouncing off ones that are too hard.
Why two to three minutes
Short sessions are a deliberate design choice, not a limitation. A focused two-to-three-minute round is long enough to get a clean read on a skill and short enough that you'll actually do it tomorrow. Consistency is what produces a readable trend line, and a habit you keep beats an intense session you skip.
Each game also stays focused on a single skill. That keeps your ratings clean: a change in your Memory number reflects memory practice, not a game that quietly mixed in attention and speed. One game, one skill, one signal.
What you're training
CogDojo spans 48 games across 6 cognitive skills. Every game belongs to exactly one skill, and every skill has its own rating that feeds the Brain Fitness Index.