How do you make a 2d multiplayer game

well to start off you must own a gaming computor or a high speed gaming chip, as well as high graphic card. next youll have to buy a software that allows you to build/create video games but it may run you up a nice $400+ bill if you buy the normal stuff. NEVER GO CHEAP! you will usually end up having to buy more stuff for the software later down the road. and you also need a creative mind to work with.glad i could help if i did. if not sorry i couldnt answere your question. for software i would recommend FRYS ELECTRONICS, they do have a website if you dont have a store around you.