This week, we have another "one under par" challenge: All level 5 puzzles can be solved with 5 swaps, but some can be solved with only 4 swaps, which is the case for the puzzles in this challenge.
Here are the 3 codes of this week's challenge: 4100-05, 5162-05, 1261-05.
To play these puzzles in the demo, you first have to unlock level 5 by solving puzzles on levels 1 to 4. 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!