By the way I thought about it some more and I reckon if it's 2D then the sloped isometric tile is exactly the same as a flat one believe it or not, they probably detect whatever is moving and have the character or whatever animate the movement downwards to make it look like it's going down then have it return to normal after exiting the slope tile.
RE: Does anyone have a subject they're particularly stuck on with games development or a genre they want a write up for that there aren't many tutorials on?