Ahh ok , what we have done in the past is actually change the image out so you essentially have 2 different versions of the image . Using media queries you have one visible on desktops and the other hidden then swap them around at a set screen size See for a good example of this . For these guys we actually built it into their theme settings so they essenitally choose a desktop image and a mobile image if no mobile image is selected it still defaults to the desktop version <| sep |> Scourge is great . Frost Hydra can be combined with ballista . Rainbow gun is just for an achievement jk It ' s quite good for invasions . Piranha gun is actually really good for the martians . So I ' d say they ' re pretty good but they ' re not really neccesary .