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. 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. NetBet Casino is an online Casino Games site.