There are a bunch of games out there (Neverwinter Nights, Baldur's Gate, many Bioware and Obsidian games in general) that use AD&D, D&D 3.5, D&D 4 or other Pen & paper Role playing systems as a foundation for their gameplay. For example, Neverwinter Nights 2 has a rather faithful implementation of the D&D 3.5 rules with a few minor changes involving spells that are changed or removed because they don't fit the gameplay.
There are certain subjects here, like the setting (several games are set in the Forgotten Realms setting or other settings originally from gaming) and questions involving mechanics (like character development, spell interaction and other things that work the same as in the original ruleset) that wouldn't fit Arqade well due to too specialized, but would be a decent fit for RPG. However, videogame related questions appear to be off-topic here.
is this kind of videogame question still off-topic? When going deep enough, they're still RPG, just in a digital setting.