Playretrogames.com is one of the best free games websites on the internet. The game library includes popular 8-bit titles from the NES era, including Castlevania and Jurassic Park. Several free online titles on the game’s website take some time to load but run without any hiccups or advertisements. Most of the 8-bit free online games support an NES controller if you have one, which is one of the best features.