15 Puzzle Series X Sky Blue.png
- Published on September 10th 2025 under the Release to Public Domain license.
- Designated to be used as <not set> icon.
- Icon for Windows XP, Vista and 7.
A minimalist icon of a 15-puzzle featuring sky blue, beveled tiles numbered with Roman numerals from I to XV. The 4x4 grid leaves one empty space in the bottom-right corner.