Level 30 of the challenging puzzle app 100 Doors 2014 is discussed on this page. Just to make it clear and not to confuse anyone with a wrong android game, we are talking about the app from nealo which you can download here. Anyway, there are dozens of levels in this game but this page will only be showing the guide for the 30th level. If you need the solutions for other levels, go here.
Written guide and video for
level 30 walkthrough of 100 Doors 2014:
Notice the numbers on each art pieces hanging on the wall and see the clue to which buttons to tap (101 = on, off, on. 011 = off, on, on). Tap on the following dots at the top part of the wall: 1st, 3rd, 5th and 6th buttons.