My latest build, and probably my most active one in a long time.
Inspired by Hugum's Original Castle Defense, I finally started making one that I might finish! Made partially as a test for my new Computer, but also just for the sake of it. Its focusing on Game play rather than Realism, which is why the build isn't close to great. However its the events that will (Eventually) be the main part of this.
Low quality images go!
The castle before any upgrades.

The castle fully upgraded (Without weapons).

The spawn room, where you can either spectate, or join the game if the door is open (Controlled from admins).
(Credits to The_Legend for the things around the doors)

The spectator room, filled with lots of seats.

The list, which is toggle-able, and the text is changeable to display all the things you can buy.

A projectile-less action shot of zombies attempting to break through the wall, and also the Pit which has spikes, and sticks over it.

A closer pic of the Pit. There is a random chance that the zombies will jump over the pit, but you can decrease the chance by upgrading 'Camo'. The sticks are no-collided.

The control room, where the admin(s) click stuff.

It is currently in Alpha 0.2. Eventually it will go to Beta, and then I might release it. It needs a lot of bricks and add-ons though.
Features:
Your main objective is to survive. Simple enough if there weren't THOUSANDS OF EVIL, BRAIN HUNTING ZOMBIES!!!! at your doorstep. Gladly for you, each time a zombie dies, a large, floating counter increases by a certain amount. It has been discovered, than when shouting out loud to no-one what upgrade you want, it will magically appear, and the number will decrease. The same goes for weapons.
The upgrades are visible by a huge list that appears when all (Or sometimes most) of the zombies are dead. They include the following:
Castle Upgrades
Castle Rooms
Left
Right
Back
Stairs
Spikes (They aren't really spikes, but bricks designed to keep zombies from climbing over the walls)(Needs all rooms)
Front (of castle)
Back (and sides of castle)
Cannons
Left
Right
Upgradeable firing speed
5 secs (Default)
3 secs
1 sec
0.1 sec
For left/right separately.
Land Upgrades
Wall
Spikes
Stairs
Gate (Closes automatically)
Moat
Pit
Spikes (Kills when fallen in)
Camo (Less chance of zombies jumping over)
Weapons/Items
Bow (Free, default)
Pills
Gun
Med-kit
Guns Akimbo
Propane Tank
Minigun (Spawns in pallet-like box)
Rocket Launcher
Current helpers:
Me (Everything)
The_Legend (Made a few bricks that look lovey)
Nickle (Gave me a list of suggestions)
Hugums (The whole base, and inspiration)
Alpha Testers:
The_Legend
Currently, no one else. I know a some people tested it in A0.1, but I didn't get their names.
If you want to help, come by my server some time and test it. You will only be added to the list if you actually help, and not just play. I'm not excepting extra eventers/builders, unless you're a good friend of mine. My computer has bad internet, so if anyone can host too, that will help.
Please only rate on the poll above. Not in the comments!