I would say they don't since some people have the achievement for reaching level 25 but not the Dreamcatcher achievement. I'll have to wait and see if leveling up gives any sort of advantage. Really hoping this game doesn't turn out to be another Hexic/Bejeweled/Zuma type game, otherwise I'm not even gonna bother going for the 100%.I did notice that the bots are rated by 'level' and that Nightmare bots are level 30. Either that or they're in a serious need of a patch, cause at the current time their name sums them up perfectly. Seeing as nobody has actually finished the story yet, I'm under the impression that there will be some sort of modifier/ability to counter them, unlocked later in the game.

Tried it out and they were finishing puzzles within 2-3 seconds.

Platinumpwnzor, not sure if it's actually unobtainable but I've seen myself what you mean with the Nightmare bots. Considering nobody who wrote a review seems to have reached the end of this game, I think we're all in the same boat, struggling to get through the overwhelming number of levels. Certain levels made me fail 30 or 40 times before I actually managed to pass them. I could be horribly wrong and I'm not trying to sound like a conceited prick, but the game is insanely difficult. From looking at the leaderboards (and now the achievement list since it's now actually up), I think I made it the furthest out of the media bunch. In regards to why nobody has completed it, up until yesterday the game was only available on the Xbox One via review codes. Hopefully knowing this bit of information will help prevent the frustrating confusion I experienced when I entered that world. The colour of block which appears at the bottom of the column matches the colour of block you shoot first. That modifier is a royal pain in the ass. There are a lot of them which are tough, but some of them stand out from the rest as obnoxiously difficult. The only advice I can give you is to use the skip tokens on the levels you really can't figure out. I've been playing this game for the last week or so and the result is that I'm on level 8-20.

Zuma blitz bot