How do I make specific tiles solid?

Hi everyone, I loaded in a tilemap so I could build a nice retro style map (like the old Final Fantasys).

How do I make specific tiles either solid, or is there a way to call the specific tile(s) number in an event like at the start of the layout to make it solid? Anyone know how to do this? Could you provide an example or screenshot? Many thanks up front

Easiest way would be to create one tilemap for the solid tiles and one for the none solid ones..

It's the only way with tilemaps. Tilemaps can't be solid for particular cells. It's either entire solid object or not.

And LittleStains suggestions is the simplest one, make one tilemap for your background arts, and other one only for collision tests.

Sounds good, thanks a lot! Will try this method