You can't play full screen at ninjakiwi or mochigames but you can at http://fgagmqab.joyent.us/SAS3/SAS3.swf - At Ninjakiwi server
http://games.mochimedia.com/c/g/sas-zombie-assault-3_v663685/SAS3.swf?mochiad_options= - At Mochigames server (you can't play private matchs there)
On Ninjakiwi and mochigames there are links that will change the page and cause you to lose your game. At this website the entire screen is taken up by the game. You can't even click outside the flash/ object area and have the keyboard controls stop working because everything is on screen is the flash/ object area. Also, unlike mochigames, you can play private matches.