Passage 100 Doors Puzzle Box by Protey Apps (Vladimir Poriadnikov). Tips and hints for 86, 87, 88, 89, 90 levels.
A complete guide: http://bit.ly/DoorsPuzzleBox
Google Play | https://play.google.com/store/apps/de...
App Store | https://itunes.apple.com/us/app/100-d...