There isn't anything inappropriate, but the puzzles may be too hard for a 6 year old.
Yes however some of the puzzle can be quite difficult depending on which theme you decide to go with you decide to go with
Yes
As far as i read it welcomes all ages. And some puzzles, depending on the room, the 6 year old can partake in some if the puzzles with adult help and supervision. The other kids would do just fine. Just watch the kids carefully as the sets can be damaged easily if forced. And 6 year olds love to touch. Haha.
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