I love puzzles as a player, but wow that first puzzle was rather challenging. The 2nd and 3rd puzzle was way easier in comparison. A much simpler starter puzzle with a tutorial for one cat or two can help newbies be introduced to this level of required trial and error. There's also a bit of cat "ghost" cards that persist when doing undos but are no longer in play. There's also the occasional glitch I had with a black cat in puzzle 4 where it was acceptable in the bottom corner, but it activated the disappearance at every other corner.