Hidden Passage Help

I am trying to create an event where it can reveal a hidden passage without transferring the player to a different map. Thank you very much.

Make sure you have in your tilesets one tile that is empty/alpha/invisible (the empty tile that is the first tile in Set B does not work for this) and draw out the path with it (make sure that invisi-tile is set as passable). That region becomes walkable even through walls and empties (black fields from A5) but doesn't show...use an Event at same priority as character at the entrance of the path to block it until conditions are met.