quake 1 is corridor shooter.
quake 2 is corridor shooter.
quake 3 is arena shooter.
quake 4 is corridor shooter.
THATS 25 - 75 !!!!!
not really.
Q1 SP is a corridor shooter.
Q1 MP is a corridor shooter.
Q2 SP is a corridor shooter.
Q2 MP is an arena shooter.
Q3 SP is an arena shooter (wtf?).
Q3 MP is an arena shooter.
Q4 SP is a corridor shooter.
Q4 MP is an arena shooter.
QC is an arena shooter.
i left out a few, like enemy territory, but essentially all the id games are in the same universe, so Quake / Wolfenstein / Doom should all be bunched up together.
Anyway, ever since Quake 1 after release, the shift went towards multiplayer; the thing is, not really a lot of people had internet in 1995 (and those who did generally had a 56k). But Q2 was so successful because everyone from Q1 who could got onboard with the multiplayer improvements, and people were foaming at the mouth for a MP shooter.
Keep in mind that Doom and Doom 2 also had MP and they both are arena shooters in MP. Doom 2 is an arena shooter in SP, as well. Or, at least, on some maps.