Upgrade serves only to take player's coins. Increased bet requ. by 150% & jackpot bet requ by over 400%. Same with daily challenge requ. Glitch in game is WORSE changing player set bet amounts from 1M per spin to over 150M per spin & setting to auto spin which then requ player to shut down app then blames the player. I've lost over 8B coins to the "glitch " w/o reimbursement. Bonuses & free spins most times don't pay ANYTHING, ZERO coins!!! Upgrade??? Upgraded stealing player's coins!