I want a campaign level on a rotating habitat where all the gravity comes from centripetal force. I want the habitat big enough that we can fly aircraft and climb buildings. And I want it to have a fast rotation rate.

A new weapon would be nice too:

Or how about a smaller ring, where enemies on the opposite side of the ring are within shooting range? Congratulations: Unless it has a ceiling, it ain't cover. Oh, and you can flank your enemies by running away from them.

: I'm thinking of: Rama Valley Forge from Silent Running The World of Tiers
: from the Farmer novels Silent Cartographer style levels where you don't
: need invisible walls to constrain the player and there are multiple routes
: to objectives

: Halo gave us a ring world and that was cool. But there are other really cool
: potential play spaces in SF.

: It looks like 343 is investing in tools and engine changes to make the game
: better. I'm not really talking about graphics - let's just take graphics
: for granted. I'm talking about the improvements to Forge. It sounds like
: they put considerable development resource into that. I'm also thinking of
: the AI changes that they have put in to help with co-op play, and the
: warthog seat swapping that will help with solo campaign play.

: Ally AI was a weak area that needed improving in Halo and was(still is?) an
: area that 343 could improve to make the game significantly better for
: campaign players.

: I think that 343 should invest the effort to make the engine support gravity
: that isn't just -z is down. They should be able to support: -z is down
: (how things work currently) down is towards a point (probably in the
: center of a moon gravity away from a point (like in hollow spheres)
: gravity away from an axis (for hollow cylinders) torus gravity

: The payback would be in the types of really cool levels that you could
: build. awesome Forerunner or Precursor structures asteroid interiors
: human orbital habitats space craft with geodesic hemispheric biomes
: linked by a network of transit tunnels small moons - perhaps in a gas
: giant's rings or orbiting a planet with the planet on one side and a UNSC
: cruiser hanging over the other side

: Most of these could give you the benefits of the Silent cartographer level.
: multiple ways around no invisible barriers required

: Imagine a human orbital habitat - a hollow, landscaped, cylinder where it
: takes a minute and a half in a warthog to drive round the circumference.
: If you were playing co-op then you could drive round 180 degrees and see
: your mates from above with your sniper rifle. Maybe the current gen can't
: handle a big enough cylinder but a torus would have a constrained area
: that wasn't all visible from one spot. Maybe it takes ten minutes to drive
: round the outer edge.

: The cylindrical habitat could have starscrapers - buildings that grow outward
: from the shell. They could have hollow interiors like exotic hotel
: atriums (there has to be a waterfall in there). There would be multiple
: levels and exterior rooms would have windows that would overlook the outer
: shell of the cylinder, other starscrapers, the zero gee end-cap
: facilities, and an awesome sky box. Could you imagine the verticality? The
: slight disoritentation from moving from an area that is a wide cylinder on
: it's side to a narrow, tall cylindrical space that plunges down from the
: floor?

Yes.

: What do you think? Is there a thing that they could add to the game to let
: them make cool levels or cool experiences?

A teleportation ability.

Think about this: If you're in an enclosed cylinder or a sphere, there's no place where you shouldn't be able to go. The boundary is the floor. So, how about a teleportation armor ability that lets you jump to where the crosshairs are pointed? Better yet, if you aim it at an enemy, it pops you right behind him, ready to assassinate.