Since the start of halo 4 I have been forging minigames and flood maps. My fileshare contains:
Flood
Look up - A fun map where the infected drop from above onto the unsuspecting spartans
Map - Look up
Gametype - Look up
Roadblock - Probably my best map, urban section of a city containing four buildings (Office, Cinema, Market/grocery store and a house). High levels of detail.
Map - Roadblock
Gametype - Upgraded flood
Chaos - A little like look up however the flood pop up from beneath the ground.
Map - Chaos
Gametype - Flood
Minigames
Avalanche - I tried to remake avalanche from halo reach. It kind works.
Map - Avalanche
Gametype - avalanche
Light show - Teams start at either side and all players have one life each.
Map - light show
Gametype - Light show
King of the skies - King of the hill, however everyone is in ghosts.
Map - King of the skies
Gametype - King of the skies
The tube - What it says on the tin, long tube with one way shields at either end.
Map - The tube
Gametype - Slayer, you choose the weapons. Try out fuel rod cannons 
The tube 2 - More tactical version of the tube
Map - The tube 2
Gametype - The Tube 2
Races
11 - Crap name i know but i’m not great at races, add yours.
Map - 11
Gametype - Race
These are my maps, everyone else add their own 