this game is too hard even on easy, i seriously would recommend making this game easy, 2/5 from me, i enjoyed this game its just too difficult and results me into taking too long to complete each mission consisting with many failure throughout each one.
i were fighting the iraiq's for about 5 mins until i realize i had to die and restart it -.- since it stated "you can not defend a whole city on your own"
In the lobby click on the top right hand corner (on the spoke options graphic). In the panel, click 'Game Options'. In the new panel there are two buttons just below half-way down, click on the right hand one - Tutorial.
 "Ants - Now with even more Ants"){kind=icon}
 "Heroic Sports Football"){kind=icon}
 "Great Game 1/5"){kind=icon}
 "Formula Racer 2012"){kind=icon}
 "Sea of Fire"){kind=icon}
 "Pawn Tactics"){kind=icon}
 "Winter Rider"){kind=icon}
 "SFG Pool"){kind=icon}
 "Clubby The Seal"){kind=icon}
 "Modern Warfare 2 - Madness Interactive Mod"){kind=icon}
 "Viviparous Dumpling"){kind=icon}
 "Undead Highway"){kind=icon}
 "Rayspline"){kind=icon}
 "The Most Boring Game Ever"){kind=icon}
 "Striker Superstars"){kind=icon}
 "Zombie Infestation 2.0"){kind=icon}
 "Field Command 2"){kind=icon}
They will be coming very soon, we're finalising designs at the moment and will be getting started in the next week or so. Exciting stuff :)