I love to implement procedural logic; here, we generate a space base.
Here's what we have:

• Legs that connect modules to the ground
• New modules snap to free doors of another module
• Modules may be connected at different heights
• A configurable generator where we specify a list of pods and the number of airlocks
• Doors between modules

Here is a purely procedural animation for a big robot. I couldn't find a good animation for a mech, so I decided to make it procedural.
What do we have here:

• Simple movement
• Feet that snap to the ground
• Rotation in place and on the move

I love survival games, so this was my first attempt to create a co-op zombie survival game.
Here's what we have:

• An animated third-person character
• Weapons that have different skins and parameters
• Very simple AI for zombies that chase you

Here, I implemented server rewind logic, which may be useful for cyber sport disciplines.
What do we have here:

• Syncing time between client and server
• Storing snapshots of player positions for the last N seconds

Just for fun, I used AI to create a simple cover-based shooter. Here's what we got:

• A very basic cover generator system that spawns covers and calculates possible cover points
• Combat decision logic that helps pawns find the best cover based on the current state of the battlefield
• A simple weapon system that fires projectiles with spread
• A custom sight system for pawns. I was truly shocked that such an essential feature as sensing enemies is so poorly implemented in Unreal Engine. It deserves a separate post. 😄
• A basic pawn that is capable of holding a weapon and using all the systems above to defeat its enemy

Things to improve:

• Multiple pawns try to take the same cover, so they become easy targets
• Friendly fire; nobody cares about killing an ally
• Pawns always try to get new cover instead of holding a good position
• Weapon reloading would add some tactical moments
• More weapons and shields would also add more tactical options