Deductive Logic5.5 min timed session
GeoSudo Challenge
Deduce the unique symbol missing at the (?) cell using row and column exclusion rules.
Launch GeoSudo 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
- 1A grid displays symbols: Star, Circle, Cross, Triangle, Square, Moon, Pentagon, Diamond.
- 2Rule: Only one figure of a particular type can appear in a row; same rule applies to columns.
- 3Locate the single (?) target cell in the grid.
- 4Inspect the row and column of the (?): only ONE symbol is missing from BOTH.
- 5Click the correct symbol from the multiple-choice options below.
Strategy and pacing
- Check which symbols already appear in the (?) cell's row first.
- Cross-reference against the (?) cell's column to eliminate all but one.