Here you can see versions of Supercell games and what encryption they have

1. Brawl Stars v1-v7 - ARC4, v7 - current - PepperCrypto
2. Clash Royale v2.1306.1 - v1.9.2 - ARC4, v1.9.2 - current - PepperCrypto
3. Clash Of Clans v1.7.0 - v9.x.x - ARC4, v9.x.x - current - PepperCrypto
4. Boom Beach v3.16.1 - v30.x - ARC4, v30.x - current - PepperCrypto

Originally in 2017, Hay Day, CoC, Boom Beach and Clash Royale had NO obfuscation of Pepper server public key in its libraries. So you can easily patch it to your own and use Pepper crypto from the core!