Regarding the Different Neighbours puzzle, it's also doable if you miss the uniqueness (I did). I've recorded a possible start . The notes are kind of hard to make out, but you should be able to follow the solve.
Wow. Thanks for that video... I now have a better understanding of how to make limiting assumptions on possibilities. Seeing the thought process unfold just made it click :)
Really this is looking interesting. I have never seen such kind of game. I would like to participate in this amazing and different game. I like such kind of things really. And i think this would be knowledgeable. So any one can tell me how i can be the part of this game.