There are thousands of Android games which are free for download in Google's Play Store, but only a handful are actually able to deliver top-notch gameplay and graphics which users enjoy. One of these titles is Dead Trigger, and if you haven't tried it, you may want to because it's completely free. But so you know, the next version has already been launched, and it's free to play as well. 

Developed by MADFINGER Games, Dead Trigger 2 borrows from the success of its predecessor - first-person shooting features. However, the game can now be played on co-op mode where you can team up with other players through Internet connectivity. 

Whether you are new in this genre, or you are a seasoned FPS player, Dead Trigger 2 definitely offers something that would let you play for hours. In addition, you would also be able to fight the undead in various locations - from scary alleys, mines, to African deserts. 

There are also several missions which help make the game a complete title. You can finish story missions, global missions and other side quests. 

Lastly, you will face a lot more zombies than in the previous version of Dead Trigger. In the second installment, you will take on bosses with fatal skills and painstakingly long lives. Meanwhile, you can gain several bonuses to help your survive the undead's onslaught. 

Like most free-to-play games on Android, Dead Trigger 2 comes with optional in-app purchases.