To change the background color on the playing board:

🧩 Start a puzzle
🧩right-click on the board with the mouse button (or tap if you use a touchscreen)
🧩 choose the background you like on the background bar

If you use a touchpad, click the lower-right corner of the touchpad, or tap the touchpad with two fingers.

❗Please note that some backgrounds are available only with the Magic Puzzles VIP subscription. Such backgrounds are marked with red ribbons and a crown.