The filename indicates a mobile application package (APK) for an Android game.
Use a service like VirusTotal to check the APK for malware or Trojans before installing.
Because this file comes from third-party sources rather than a verified store, you should exercise caution:
Be wary if the app asks for unusual permissions (like access to your contacts or SMS) that aren't necessary for a game.
: likely refers to a specific build or update version.