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