Signal Desk

Add Signal Desk to this device

Good to know

  • An internet connection is required. Nothing works offline.
  • Adding it does not request permissions or send notifications.
  • The app window and browser tabs may use separate storage, so practice records can look different.
  • Menu names and positions vary by browser and version. To remove it, use your browser’s or device’s app settings.

Color Mosaic

From 3×3 up to 6×6, find the one tile that is a little different. Take your time.

  • 6 rounds · untimed
  • Screen
  • Mouse or touch
  • Keyboard
  • No permission needed
← Game lounge

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In fullscreen, select the differently coloured tile. Arrow keys move, Enter selects, Space advances after feedback. H shows/hides controls; Esc exits fullscreen. This practises colour distinction, not dead-pixel detection or colour calibration.

Ready

Progress
Round 1/6
Rounds found
0
Discoveries by roundSix colours, a moment to notice.

    Find the one tile that differs slightly from the rest. Arrow keys move, Enter selects.

    Makes the colour difference larger. Shown in the result. No time limit. Take your time. The screen never flashes. A colour-spotting game for fun. It does not test eyesight or colour vision, cannot find dead pixels, and does not measure the display.

    How it works and limits

    How to play

    • Press Start, then press the tile that looks different. You get up to three picks per round.
    • A wrong tile gets a ✕ and “Not this one”. After three wrong picks the answer is shown.
    • A hint shows the row. “Easier contrast” widens the difference. Both appear in the result.
    • Keyboard: arrow keys move, Enter or Space selects. You move to the next round yourself.

    How rounds are made

    Each round uses one fixed colour with one tile slightly lighter or darker. The difference shrinks gently from 16 to 6 (HSL lightness %). Nothing flashes or moves.

    Limits

    A colour-spotting game for fun. It does not test eyesight or colour vision, cannot find dead pixels and does not measure the display. For screen problems use the solid colour patterns in the screen test.