Call of Mini: Sniper by Triniti Interactive Ltd.

it's SHOOT to KILL in this ALL-OUT WAR with the UNDEAD...★★★★★
use GUNS, ROCKETS, and even PROPANE TRUCKS to HOLD THE LINE! the ZOMBIES WON'T STOP but NEITHER WILL YOU!
★★★★★
A mysterious corporation has been testing weapons in the mountains, and those new bioweapons had an unexpected side effect: zombies! You are Rod, the sheriff of Muerte Vista and the only thing standing between the last survivors and complete zombie apocalypse. Time to take aim and save the world one headshot at a time!
★★★★★
✓ BRUTAL first-person survival action!
✓ ULTRA-REALISTIC guns!
✓ JAW-DROPPING explosions!
★★★★★
✓ 6 BLOODTHIRSTY zombie types!
✓ 21 LETHAL weapons!
✓ SWAT backup!
✓ EXPLOSIVES bring the BOOM!
✓ NONSTOP zombie assaults!
★★★★★

View on Play Store: https://play.google.com/store/apps/details?id=com.trinitigame.callofminisniper

Please read the Disclaimer before using any cheat from this blog.
Check out the Tools section for cheating machines. 

A. Money Cheat

1. Open GameGuardian.
2. Start the game.
3. Press GameGuardian logo
4. Search your current amount of money
5. Use your money, buy some stuff.
6. Search the new amount
7. Find your new amount of money from the results
8. Repeat this process until you get a few values (1-5).
9. Long press the address and change them to whatever you want.

B. Ammo Cheat

1. Open GameGuardian.
2. Start the game
3. Start a level.
4. Search your current amount of ammo.
5. Return to the game and use some ammo. Shoo!
6. Search the new amount
7. Find your current amount of ammo from the results
8. Repeat this process until you get a few (1-5) values.
9. Save them all as the max value of ammo for that gun (too high of a value may crash the game).