Setting up impassible tiles, need help

I recall a while back when I first got MV that there was a way to program the region numbers by using one of yanfly's plugins, or I think so at least. Other than using a plugin is there another way to set certain tiles as impassible?

You can edit tiles in Database -> Tilesets and mark specific tile in 3 ways:
- circle - can walk
- x-Mark - can't walk in any direction
- star - you can pass below tile (like hiding under roof)

In addition you can mark tile passable 4 direction (wich means you pass a specific tile from certain direction(s) ) or even set ladder

And you can also set up events to block stuff. Just make sure to set them as Same As Character.

it depends on how you make your maps.
with regular mapping, you shouldn't use the region move block either never or only for specific blocking of random move routes or similiar effects.
with parallax mapping a lot of people are using region move blocks for easy blocking, but even then it would be much better (although also much more work) to use an invisible tileset for blocking - that way you could use the different forms of passability even with parallax maps.

Awesome, thanks.

Edit: Is there a way to set a tile as a ladder but allow people to pass under it from the left and right sides? Or do I have to block off the sides? For example, like a tree house.

Yes, set in Database->Tilesets
your tile following:
Passage - star-mark (passable under tile)
Passage (4 dir) - your directions
Ladder - ladder mark

(did not check yet)

That doesn't seem to work, I can pass behind it but when I go to climb the ladder I still pass behind the tile.

So, you want a ladder wich can be passed from left to right and vice versa but under tile?

Yeah, so when you walk around and behind the ladder you pass under it but when you climb the ladder you pass over it. Same effect that a bridge should have when you walk under but then when you enter from the sides of the bridge, where you would cross it, you pass over those same tiles.

I recall maybe one of yanfly's plugins allowing this but its been a long time. I'm trying to remember.

The only solution I come up is do by eventing with conditional branches, check players direction and set Transparent On/Off depending which direction he goes.

Ah... ok. Transparent? That sounds like a plugin command that maybe turns the player character invisible?

No need for plugin, In the event page you are able to turn transparency on/off wich toggles player to be visible or not. (second tab)