ive been playing Doom for a while now and was just wondering. in all of our games the only grates that we ever had the trites and marines with lithe use were the blue ones that you put on the board. now im my last game i was looking at the tiles very closely and saw all the other grates printed on the actual tiles. are trites and maines supposed to be able to move between those grates as well as the blue ones?

Only the purple/blue counters are 'teleport'able by trites and lithe marines. The others are assumed to be too tight or stuck.

There is no terrain printed on the map, it's all just scenery. Only the token grates can be used like this.