A grid pattern is missing one piece. Identify which of the four options correctly completes the pattern. Work fast — speed matters!
Easy
2×2 grids, 15s per trial, 10 trials
Medium
3×3 grids, 12s per trial, 12 trials
Hard
3×3 grids, 9s per trial, 15 trials
Scientific Background
Based on: Matrix Completion / Visual Pattern Completion Subtest (Lezak et al., 2012)