City Sigi 4 free online war shooting game.City Sigi 4 its a complex flash games with multiple levels and upgrades. Your mission is to invade the planets and kill all aliens you encounter on your way. Wen playing this free online war shooting game, you're in charge of your team to organizing your troops, in killing all the aliens.Upgrade you weapons and select all 20 levels and prove your commander skills in this new flash shooting game called City Sigi 4. Don't forget save the humans and use your special skills like air strike,heal and nepalm. Prove you are the best and have a blast with the missions. Good Luck!