Restricting entities to water tiles

[ValhallaHawk]

Hi engineers,

Sorry if this is a silly question, I'm working on my first mod so I'm still getting familiar with everything.

I'm trying to create an entity that's exclusively placed on water tiles. I tried using collision_mask but it hasn't worked and I suspect that's not the solution. Anyone know if it's possible to do this? Thanks!

[Natha]

Collision mask is the way to go, what did you do so far?