Shade Radar Color Difference Game | Find the one tile that is slightly off
Among tiles of the same color, one is slightly different. Find it and tap it. Each level adds tiles and shrinks the gap. At the end you see your level and score, along with the smallest gap you told apart and a sample of those two colors.
💡 About This Tool
The board starts at 2×2, gains a column every 3 levels and tops out at 8×8. The gap is shown as ΔE (delta E), on a scale where black and white are about 100 apart. The smaller the number, the harder the gap is to see.
| Level | Board | Color gap ΔE (approx.) |
|---|---|---|
| 1–2 | 2×2 | 24–21 |
| 3–5 | 3×3 | 18–13 |
| 6–8 | 4×4 | 11–8.4 |
| 9–11 | 5×5 | 7.2–5.3 |
| 12–14 | 6×6 | 4.6–3.4 |
| 15–17 | 7×7 | 2.9–2.1 |
| 18+ | 8×8 | From 1.8 down to 0.5 at level 27 and beyond |
Standard gives 15 seconds per round. Relaxed has no time limit. Both give 3 lives. A correct tile scores level × 10, and Standard adds remaining seconds (rounded up) × 2. Level 10 with 8 seconds left is 100 + 16, so 116 points.
Your rating depends on the smallest gap you got right.
| Smallest ΔE | Rating |
|---|---|
| 1.0 or less | Super Color Sensor |
| 1.8 or less | Color Master |
| 3.0 or less | Sharp Eye |
| 5.0 or less | Good Judge |
| 9.0 or less | Plenty of Room to Grow |
| Above that | Warming Up |
This is a game, not a medical color vision test. The result can't tell you anything about your eyes or how you see color. People naturally differ in how they see color. If you have concerns, talk to an eye doctor.
🧐 FAQ
Q: Can I play if I'm unsure about my color vision? A: Set "Type of gap" to Brightness, and the rounds rely mainly on differences in brightness. Hue is also available. Changes apply from the next game.
Q: Why do my results change from one day to the next? A: Screen type, brightness, night mode, room lighting and viewing angle all change how colors look. Results from different devices can't be compared.
Q: Can I use a keyboard? A: Yes. Move with the arrow keys and confirm with Enter or Space. P or Esc pauses. In fullscreen, the first Esc pauses and a second Esc closes fullscreen.
Q: Can I study the board while paused? A: No, the board is hidden during a pause. The game also stops by itself when you scroll the board off the screen or switch tabs.
Q: What if I close the page in the middle of a game? A: Next time, "Continue" brings you back to that level with a new board and a full 15 seconds.
Q: Can I delete my records? A: Press "Delete all records" twice. That removes your best records and recent games.
📚 Fun Facts
The scale behind this game is OKLab, a color space published by Björn Ottosson in 2020. It was designed so that equal distances look roughly equal to the eye, which plain red, green and blue numbers do not manage. Moving those numbers by the same amount can be obvious on one color and nearly invisible on another.
The ΔE here is the OKLab distance × 100. Because screens store each color channel in whole steps from 0 to 255, the game rounds each tile to real screen colors and then measures the distance again. So the number you see is the gap after rounding, not the gap it aimed for.