How to play
- 1
Numbers appear with a rule: biggest, smallest, 2nd biggest, even, or odd.
- 2
Tap the number that matches the current rule.
- 3
The rule changes every round, so do not autopilot.
What this test measures
This game measures cognitive flexibility: dropping the last rule and applying a new one without slowing down. Autopilot fails as soon as biggest becomes smallest.
Score guide
| Grade | Range |
|---|---|
| Mastermind | 25+ pts |
| Sharp | 18–24 pts |
| Good | 12–17 pts |
| Average | 6–11 pts |
| Beginner | 3–5 pts |
| Novice | 0–2 pts |
FAQ
- How is the score counted?
- Each correct tap scores about 1 point plus a small speed bonus. One mistake ends the run.
- How often does the rule change?
- Every round. Read the prompt each time before you tap.
- What are the rules?
- Biggest, smallest, 2nd biggest, even, or odd — whichever the banner shows.
- Is this a clinical flexibility test?
- No. It is a short switching game, not a diagnostic battery.