While searching for interesting puzzles, I came across only two level 3 puzzles that can be solved with 2 swaps. Unfortunately, I never found a third one. Therefore, the third puzzle of this week is a level 4 puzzle that can be solved with 3 swaps.
The 3 codes of the puzzles are: 8507-03, 3439-03, 2939-04.
To play these puzzles in the demo, you first have to unlock level 3 by solving puzzles on levels 1 and 2. Then you start a game with NEW GAME (in the main menu) and select CODE instead of a level to enter one of the codes.
Enjoy and please let me know what you think of these puzzles!