First off, i read somewhere there was already a simillar suggestion, but I cant find it, so here is my two cents on the subject.
I believe that Rooms should be upgradable, to a maximum level of 3. This will allow us to put more creatures into DKWFTO without having to add whole new rooms for each one. Using the Info Tab, a Keeper can see the stats and other tidbits on whatever he clicks on. By clicking on a room, you can not only see its info, but choose to upgrade it for a hefty price. This makes the room more effective and allows you to attract more powerful creatures. Rooms like the Graveyard and Temple can also be obtainable much sooner, with the final upgrades obtainable much later and for ginormous prices.
For example, a training room can only attract basic creatures like the Spider, Demon Spawn, etc... at level 1. But a level 2 Training Room will attract creatures like Orcs, and a level 3 Training Room could attract something even more powerful.
The Lair cannot be upgraded, it is simply a lair.
AESTHETICS
The first thing you will notice when upgrading a room is that its looks different. it is more elaboratley decorated and new furniture is added.
Hatchery:
Level 1: Simple plot of land.
Level 2: Adds hutches and housing for the chickens.
Level 3: Adds hutches into the walls, to save space and produce more chickens.
Treasury
Level 1: Simple treasury.
Level 2: Huge chests added to store more gold in each tile.
Level 3: Chests added to indentations in the walls, allowing more gold to be stored in the treasury.
Training Room
Level 1: Basic Training Dummies and stationary ranged targets. Can train creatures to level 4.
Level 2: Rotating training Dummies and moving ranged targets. Can train creatures to level 5.
Level 3: Classic spinning posts and advanced moving ranged targets. Can train creatures to level 6.
Library
Level 1: Basic row bookshelves.
Level 2: Some tables and chairs added to make researching more comfortable and productive.
Level 3: Adds central table which seats many researches in a small space. Bookshelves are much taller, to hold more books and scrolls.
Workshop
Level 1: Simple anvils, forges and workbenches.
Level 2: Adds a few chalkboards and blueprint tables for brainstorming and upgrading designs.
Level 3: Adds machinery, including the classic "Steam Machine" from DK1.
Tavern
Level 1: Simple tables, stools and a bar that seats a few creatures.
Level 2: Adds tables that seat more creatures in a small space. Adds wall boothes to seat more creatures and upgrades the main bar to seat more creatures.
Level 3: Adds Roulette from the Casino.
Torture Chamber
Level 1: Simple electric chairs and torture racks.
Level 2: More advanced torture devices like the iron maiden and lava pits.
Level 3: Specialist Torture Tables from DKI.
Prison
Level 1: Simple prison.
Level 2: Balls & Chains added to prisoners. Slows prisoners in the event of a breakout.
Level: Prisoners can now be chained to the walls for more space.
Combat Pit
Level 1: Simple pit dug into the ground.
Level 2: Stone/Steel pit from DKII.
Level 3: Elaborate and ornate colloseum soaked with blood.
Graveyard
Level 1: A simple plot of dirty with no headstones.
Level 2: Adds headstones.
Level 3: Adds open graves, tombs, crypts and urns.
Temple:
Level 1: A simple shrine sits in the center of the room, with idols of worship along the walls.
Level 2: Adds a central pool
Level 3: Adds the magnificent pillared central pool with statue from DKII.
CREATURES
The following creatures that are attracted by certain level rooms. Will contain creatures that are not in the game, just to show how many creatures we could use with this system.
Hatchery:
Level 1: Beatle, Fly, Goblin.
Level 2: TBC
Level 3: Bile Demon.
Treasury
Level 1: Rogue.
Level 2: N/A
Level 3: Dragon.
Training Room
Level 1: Spider, Demon Spawn.
Level 2: Orc, Hobgoblin.
Level 3: Black Knight(with combat pit)
Library
Level 1: Warlock.
Level 2: Necromancer.
Level 3: Dragon.
Workshop
Level 1: Troll, Bile Demon.
Level 2: Ogre.
Level 3: N/A
Guard Room
Level 1: Dark Elf
Level 2: TBC
Level 3: TBC
Tavern
Level 1: TBC
Level 2: Rogue.
Level 3: TBC
Torture Chamber
Level 1: N/A. Can create ghosts from the dead.
Level 2: Misstress.
Level 3: N/A
Prison
Level 1: N/A
Level 2: Executioner.
Level: N/A
Combat Pit
Level 1: N/A
Level 2: Black Knight.
Level 3: TBC
Graveyard
Level 1: Ghoul. Can raise Zombies.
Level 2: Necromancer. Can raise Wraith's, Wights and Wraith's.
Level 3: Can raise Vampires, Liches and Mummy.
Temple:
Level 1: Cultist.
Level 2: Black Gaurd.
Level 3: Dark Angel. Able to Summon Horned Reapers.
This seems like a massive nuisance to the player to train the more powerfull creatures. - Kyle