MichaelPalin: When you say "adventure", are you referring to "graphic adventures"? I talk about them in section
Some Positive Examples. By "adventure" I refer mostly to games like Elder Scrolls series and similar games, where there is a focus on exploration and, yet, you are forced to fight to progress.
I just noticed this comment and decided I had to say something:
What I consider to be a "pure adventure game" is an adventure game that doesn't have aspects from other genres; in particular, said game can't have a battle system. I could cite Shadowgate (NES) as an example of this; in that game, encounters with monsters are treated as scripted puzzles rather than action or RPG-like combat sequences.
(I actually think that many people define genres so broadly that the categorizations are no longer useful; I'm like this with the RPG genre as well; too many people use the term "RPG" to refer to games that I do not consider RPGs at all.)
paladin181: RPGs typically involve some type of character customization and skill development.
The way I see it, RPGs are games where the character's skills, rather than the player's, are what determines whether an action succeeds or not. The player's role is thus limited to determining what the characters are doing; in a sense, the player is an invisible commander rather than a character within the game.
(Note that this definition, like any, has its edge cases; it classifies Morrowind as an RPG and Oblivion as a non-RPG.)