Google Play Store. Games like Genshin Impact (18GB OBB), Call of Duty: Mobile (7GB), and PUBG Mobile (4GB) are safe and high-quality.
If you own Black Ops 3 on PC (Steam/Blizzard) or Xbox, you can stream it to Android via:
Call of Duty: Black Ops 3 is a first-person shooter game developed by Treyarch and published by Activision. The game was initially released for PlayStation 3, PlayStation 4, Xbox 360, Xbox One, and Microsoft Windows in 2015. Later, it was ported to Android devices, allowing gamers to experience the thrill of Black Ops 3 on-the-go.
If you truly want to play the original Black Ops 3 on your Android screen, follow this legal and safe method using cloud gaming.