First off, to the people asking for help with levels, let me point out the obvious: THIS IS A REVIEW SECTION! NOT A PLACE FOR YOU TO ASK FOR SOLUTIONS! 😡 If you want a solution just Google it. They're all out there, but you'll be happier if you figure it out yourself.
Phew! I've wanted to get that off my chest since version 1. Now, for my review:
Maybe it's because I finished the first Dooors game, I am finding most level in this one relatively easy. There are some concepts (like the mirrored numbers) that probably would have stopped me cold if I hadn't already encountered them.
As with the first Dooors, the first ten are pretty easy, and few later ones had me wondering "Is that all?" But most of the puzzles are challenging enough to make you feel like you've accomplished something when you solve them. Lots of fun.
And to answer the 49 level question (as a bonus for reading this far): turn the phone upside-down and you'll see what needs to be subtracted for the solution.