So I'm making a game for a college project and in the game the player is able to play a boulder into the river. I want the player to be able to walk over it to cross the river. However because the river is a solid tile map the only way I could find was to make the entire tile map not solid. Does anyone know anyway I can make a small section of it passable. I don't need them to jump on to the boulder right now. just walking's fine.