Domino Effect! app for iPhone and iPad

This is a puzzle game where you have to manipulate domino that they all fall in a chain reaction according to certain rules.

Rules:
-All dominos must fall and none must crash into another;
-One special domino must fall as last domino and that domino triggers the exit door to open when you enter the exit door the level has been completed;
-You may rearrange as many dominos as you want, except for the trigger. You may not place dominos in front of the doors, except for the vanishing domino.;
-You may push push once to start a chain reaction with the dominos leading to the fall of all of them;
-All this has to be done within a time limit (which is normally generous);
-There are 11 different dominos that behave differently when pushed, some fall, some not, some wait a bit before they fall, some raise, some toppler until they meet an obstacle;
-There is a help in the game and introductory levels that show how all the dominos work;