I like that.
I am not sure but think that weapon was available in single player and vaguely remember using that or something like that.
I don't do multiplayer. Ever.
I couldn't remember if it was in the main game or not. I've never been too big on online multiplayer (except Quantum Of Solace which was really fun online), but I mainly played this splitscreen with a buddy of mine. At the time we played a lot of splitscreen together, like this, Goldeneye, Halo and some other shooters. The guided missile was fun but it really changed the game into something other than a shooter. Whenever we'd play with them we'd basically spend the whole game on opposite sides of the map trying to kill each other with guided rockets, the trick being to land your missile on him before he could hit you with his. We'd never even see each other except through the view screen of the missile. In this game you could play the multiplayer game against bots, so if you ever manage to get it installed in Windows 10 you should check it out.