What Changed?

A grid, a blank screen for a moment, then the same grid with one to three differences to spot.

Rules

  1. A grid of drawings appears for a few seconds, then the screen goes blank for a moment.
  2. The grid comes back with one to three differences: a drawing added, removed or swapped for another.
  3. Tap the squares that changed, then submit. Each wrong square costs as many points as a right one earns.
  4. Easy: 3 × 3 and one difference. Normal: 4 × 4 and two differences. Hard: 5 × 5 and three differences.
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