With a bit of a delay, here is this week's challenge: All level 6 puzzles can be solved with 6 swaps, but the puzzles of this challenge can be solved with only 5 swaps.
Here are the 3 codes of the puzzles: 7784-06, 7870-06, 7887-06
To play these puzzles in the demo, you first have to unlock level 6 by solving puzzles on levels 1 to 5. 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!