How to play HDD Puzzle.
The compiled picture of different looks of the hard disc is split in 8 columns and 5 rows, forming 40 squares, appearing in different positins.
Click on the square to rotate it, until it fits the original computer image. The "hint" button, at the top left,
can be pressed to reveal unsorted pieces.
Know how the computer HDD looks like.
Winning the game rewards +1 Knowledge Level
Here is a gameplay movie of square rotating puzzles YouTube.