Every time you finish a level you are put in a new location with a new gun, and you must survive as many levels as you can. Every five levels you must face more enemies. It has a zombie mode, gamepad , a custom rules mode, and two-player local co-op.Features • Two-player Co-op (Local) • Custom Rules Mode • Zombie Mode • Gamepad • Ten Locations • Ten Guns (including cross bows, rocket launchers, and mini guns)Try the Demohttps://play.google.com/store/apps/details?id=com.grantsgames.GunUpgradeDemoMore DetailsOffline: YesLightweight: less than 25MBInput Methods: touchscreen, keyboard+mouse, & gamepadCategories: top-down shooterThemes: 2d, war, survivalPlayers: 1-2 local co-opExport/Import Save: YesSave Files: 1

// Option A // 4e342w

To Gun Upgrade mod from happymod.cracksite.info.
You need enable the option "Unknown Sources".
1. Click on the above link to Gun Upgrade mod APK.
2. Save the file in your device s folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B // x1915

To Gun Upgrade from HappyMod APP, you can follow this:
1. Open your browser and the HappyMod APK file from happymod.cracksite.info - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android s and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Gun Upgrade in HappyMod App.