In the case of Epic Seven, the game can be downloaded and installed from the App Store (for iOS devices) or Google Play Store (for Android devices) without a serial key. Once installed, the game can be played for free, with optional in-app purchases.
Epic Seven operates on a free-to-play model with in-app purchases. The game doesn't use serial keys for activation. Instead, users can access the game by creating an account and logging in.
