This is the order they were added as far as I can tell from the database:
- Monster Mansion
- Crystal Caverns
- Winter’s Scream
- Shadow’s Descent
- Heaven’s Hell
- The Ascension
- Torture Dungeon
- Hill House
- Winter’s Howl
- Death House
- Miner’s Deceit
- Beach House
- Frosty Spire
- Knight’s Challenge(s)
- Dark Shadows
- Knight’s Training
- Dungeon Dead End
- Devil’s Reservoir
- Skelotens
- Catacombs
- Fish Temple
- Cosmic Collapse
- Jungle’s Echo
- Shadow Requiem
- Cyber Complex
- Forest Fire
- Green Hill Zone
- The Hell Palace
- Inferno Battlefield
- Lunar Mineshafts
- Decrepit
- bewitched
- Snowyville
- Beach House v2
- Cryptic Castle
- Glass Castle
- Mystic Library
- Christmas Night
I don’t have dates though and I’m not sure if I listed some that weren’t even zombies maps.