Categorical Similarity5.5 min timed session
Oddo Challenge
Identify the odd-one-out belonging to a different category or attribute set.
Launch Oddo Challenge simulatorAdaptive staircase calibration
Difficulty scales dynamically from Level 1 to 25 based on response precision and speed. Correct answers advance difficulty (+1 level); mistakes drop difficulty (-1 level) to measure your cognitive ceiling.
Benchmark accuracy
Complete at least 6 questions in a full timed session with ≥75% accuracy to unlock higher difficulty baselines and persist high-water marks.
Assessment rules and guidelines
- 14 to 6 items (words or visual shapes) are shown.
- 2All items except one share a strict category or attribute membership.
- 3Verbal puzzles test semantic hierarchies (e.g. 4 mammals + 1 reptile).
- 4Visual puzzles test non-sequential attribute groupings.
Strategy and pacing
- Formulate a category tag that encompasses at least 3 items.
- Do not look for sequences—look for group membership.