Suppose you have a game with following modes:
- a human player with no opponents
- a human player with a computer/AI opponent
- multiple human players
The third mode is referred to as multiplayer. The term single-player could apply to both first and second one. How one usually differentiate between the two? If there is no established practice, what terms would at least stronly suggest this difference?
The Wikipedia has an article on "single-player" games. Google search yields mostly "single player" results. Are both correct and is "singleplayer" acceptable (similarly to "multiplayer")?
Update
The best I could come up with was "solo" or "solitary mode" for the first option (only because it brings to mind "solitaire" or "peg solitaire" games which are just that: games without opponent). "Puzzle mode" (as suggested in comments) in the case of logic-strategic game sounds OK, because you usually don't solve puzzles against someone. Most of the other suggestions would be acceptable only if paired with the term for single-player mode against computer, which is most problematic here for me.
I'm beginning to think that there are no appropriate terms for that. Perhaps it's because there aren't that there aren't that many games with no-opponents options. The only ones that come to mind are simulations or economic games with a never-ending or long running "free-play" modes.