About Neverwinter Nights 2: This is a computer role-playing game developed by Obsidian Entertainment and published by Atari. It is the sequel to BioWare's Neverwinter Nights (NWN), a successful game based on the Dungeons & Dragons role-playing game. Where NWN was based on the Dungeons & Dragons 3rd edition rules, NWN2 is based on Dungeons & Dragons 3.5 edition rules (also known as the Revised 3rd Edition), changed to adapt to real-time gameplay.