The entire building was occupied by zombies and your girlfriend was trapped on the roof. With your own efforts and your gun blood to clean up the entire building, go hero!
★ Complete different difficulty, trigger different scenarios
★ 25 kinds of guns waiting to be unlocked, real realistic firearms
★ Zombies are violent, say goodbye to slow zombies
★ You can get gold coins through endless mode
★ Once captured by the zombies, please click on the screen crazy to break free
You may never save her, maybe. . .

// Option A //

To download Gun Blood Zombies Building mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Gun Blood Zombies Building mod APK.
2. Save the file in your device Downloads 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 //

To download Gun Blood Zombies Building from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - 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 downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Gun Blood Zombies Building in HappyMod App.