• ✓Idea: sweep your eyes with a system instead of looking at random
• ✓Six kinds of difference — gone, moved, swapped, flipped, bigger, smaller
• ✓No difference is colour alone, so a colour-blind child can play every round
• ✓Side by side on a big screen, stacked on a phone
• ✓Solo, or two friends on one screen with a picture each
• ✓Play against a friend far away, with a room codeplanned

✓ = done · ☐ = planned. Every game is built one step at a time like this.