Problem Solving
Cairn
Swipe to slide and merge stones — reach the target tile before your move budget runs out.
Problem Solving · Planning Under Constraint
Cognitive skill
Problem Solving
Session length
2–3 minutes
Difficulty
Balanced
What it trains
The skills behind Cairn
Planning Under Constraint
Merge-Tree Look-Ahead
Spatial Reasoning
What it measures
How Cairn feeds your trends
Every session contributes to your Problem Solving rating, which rolls into your Brain Fitness Index — a single 0–100 score across all six skills. Difficulty adapts to you, so Cairn stays in your stretch zone, and you can review how it trends over time on the web dashboard.
CogDojo measures and motivates your training. It is not a medical product and does not diagnose, treat, or prevent any condition.Play Cairn in the CogDojo app
Quick 2–3 minutes sessions on your phone. Watch your Problem Solving trend take shape — free to start.
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