. Hellfire is a 5-reel, line online slot game with instant play, autoplay BONUS: Welcome Offer: % First Deposit Bonus + Bonus Spins! NetBet Casino. [HOST] Continue or Cancel. Hellfire is a 5-reel, line online slot game with instant play, autoplay BONUS: Welcome Offer: % First Deposit Bonus + Bonus Spins! NetBet Casino. NetBet Casino is an online Casino Games site. Find out everything you need to know about NetBet Casino before you play. Find out everything you need to know about NetBet Casino before you play. NetBet Casino is an online Casino Games site.