about 2 years ago - Crater Creator - Direct link
I’ve done a base that makes use of murder holes. I prefer Molotov c*cktails, but any grenade type should work.

I made 5x5 block platform resting on four pillars, about 4 blocks off the ground. The pillars are close to the center, with shapes and rotations chosen to form an X pattern with the center block open. The platform has a hole in the center with a hatch. I made four of these platforms in a square, connected by catwalks.

On horde night, I can run from one platform to the other, shooting down at anything attacking the pillars that aren’t directly under me. But when they do cluster directly under me, I can open the hatch and drop a pipe bomb or other explosive. So long as the pillar shapes are chosen with care (I used ramp incline blocks on their side, but you could go for something smaller like poles), each bomb you drop should hit every zombie attacking that quadrant of the base.

There’s enough redundancy with the pillars that you could lose one here or there, or even a whole quadrant, and retreat to the remaining structure. But in fairness, I haven’t tested this design into the late game. The farthest I got was putting a roof over the platforms to redirect vultures into my field of view. By that point it was time to move my base to a new location, with a different design.

A defining aspect of this design in my mind is the directness and lack of gimmickry. You are not using obstacles to direct the zombies along a path. They can come at you any way they want to. The build will succeed or fail based on your movements and direct actions during the night, while still giving you enough space and the right angles to make that happen.