After 20 hours of gameplay, I have completed the game, made more than 5 levels in the level editor, and won +100 randomly generated levels, and perfected every single level (the other hours are there because someone else is playing on slot 2), all I can say: this game is one of the best puzzle games i've played.
Remember when you thought that Hexcells Plus was hard? Ha, Hexcells Infinite just laughs at that.
The puzzles are so well made and most of the time you'll stare at your screen for a good 10 minutes until you see what you have to do for the next step, and often it turns out to be the most simple thing, the game hides its clues very well in the least obvious way possible, so I really recommend playing the first two games before this one to get you ready, but before you do that, i'll let you know, that no matter what, there is no need to guess in all of the Hexcells games at all, so try to think twice before you make your next move!
And now, the new stuff! Randomly generated levels, I find them pretty enjoyable, they are all possible without guessing, which is impressing! The only problem I have with them is that they are kind of "too easy" compare to Hexcells Infinite levels, but I don't blame the creator for that, they are still very enjoyable to solve.
And the last thing left, the level editor, yes you heard me, a LEVEL EDITOR, everyone likes level editors (Ri.. right??), however, the level editor does not come with the game and needs to be downloaded from the Steam Community, but I didn't really mind that, the level editor also has an auto-solver that tries to solve your puzzles to make sure they are 100% possible without guessing, and I find that neat, the editor is fun to mess around with, and will sure give you a few hours of enjoyment.
And now for my final opinion:
Hexcells Infinite is a MUST for any puzzle fan, it's great, fun, and cheap, and has a great replay value because of the randomly generated levels, and the level editor.