RimWorld: Killbox & Defense Layout Encyclopedia
Every killbox design ranked: singularity, heat trap, funnel, and the new meta for each storyteller. Turret placement, cover mechanics, sapper-proofing, and mortar pits.
On the rim, your colony lives or dies by its defenses. A single breach raid can end a 50-hour colony in minutes. This guide covers every killbox design, cover mechanics, sapper-proofing, turret placement, and storyteller-specific defense strategies for Cassandra, Phoebe, and Randy.
šÆ Cover Mechanics: The Math
RimWorld's combat is a dice roll. Cover reduces the attacker's hit chance. Stacking cover is multiplicative, not additive.
| Cover Type | Block % | Best Use |
|---|---|---|
| Sandbags | 57% | Colonist shooting position. Place in a line, colonists stand behind. |
| Barricade | 57% | Same as sandbags but uses steel/stone. Indestructible vs fire. |
| Wall (corner peek) | 75% | Best cover in the game. Colonist peeks around corner ā 75% block. |
| Wall + Sandbag | 83% | Wall corner + sandbag in adjacent tile. The meta: best possible cover. |
The Wall-Sandbag Meta
š° Killbox Designs Ranked
Classic Singularity Killbox
A long 1-tile-wide tunnel ending in a large open room. Enemies enter single-file. Your 10 colonists stand at the far end, all shooting the entrance. No enemy can fire back until they exit the tunnel. Place sandbags at the tunnel exit so enemies can't stop to shoot. Turrets on side shelves for crossfire.
Best for: All storytellers, all raid types except breach/sapper.
Heat Trap (Burn Box)
Enclosed room at the killbox entrance. Wooden floors + wooden barricades. When enemies enter, molotov the barricades. Room reaches 200Ā°C+ in seconds. Everything inside dies ā including loot. Stone doors to contain heat. Best on mountain maps with overhead roof.
Best for: Late-game tribal raids (50+ enemies). Insect infestations.
Funnel Killbox
Open field narrowed by walls into a V-shape. Enemies are forced into a kill zone 5-7 tiles wide. Colonists line up on the wide end. More forgiving than singularity ā colonists can spread out, fewer friendly fire incidents.
Best for: Early-to-mid game. Colonies with 6-8 shooters.
Turret Hallway
A 2-tile-wide corridor with turrets every 3 tiles on both sides. Enemies walk through and get shredded by crossfire. Expensive in steel and components. Requires constant rearming.
Best for: Mid-game when steel is abundant. Combined with a singularity entrance.
š§± Sapper-Proofing Your Base
Sapper raids ignore killboxes. They mine through walls and mountains to reach your bedrooms. Counter-strategies:
Sappers target the shortest path to a bedroom. Double-thick granite walls everywhere except your killbox entrance. They'll choose the killbox as the shortest path.
Place an unpowered turret behind a single-thickness wall where sappers approach. They'll mine toward the turret ā and walk right into your prepared defenders.
Build mini-bunkers inside your base. A 3Ć3 room with sandbags, 2 doors, and a shelf of EMP grenades. If sappers breach, your colonists fall back to these positions.
š¤ Turret Placement Guide
| Turret Type | Range | Damage | Best Placement |
|---|---|---|---|
| Mini-turret | 25.9 | 11/shot | Killbox side shelves, 3 tiles apart. Provides covering fire while colonists shoot. |
| Autocannon | 32.9 | 25/shot | Back line of killbox, behind colonists. Long range, high damage, slow fire rate. |
| Uranium Slug | 44.9 | 60/shot | Outside base walls for centipedes. Extreme range, extreme damage, very slow fire. |
| Mortar | 500 | 50 AoE | 4-6 mortars in a central cluster. EMP shells for mechs, HE for sieges, Incendiary for tribals. |
FAQ
What's the minimum defense for my first year?+
A 7-tile-wide corridor ending in a 9Ć9 room. 3 sandbag positions for colonists. Wooden traps along the corridor floor. That's enough for the first 3-4 raids.
How do I deal with drop pod raids?+
Interior turrets in every room. Drop pods bypass outer walls. Keep a shelf with EMP grenades in your dining room. Draft all colonists IMMEDIATELY ā don't wait for them to reach positions.
Randy Random sent 50 manhunting squirrels. Help?+
Block all doors with a drafted colonist standing in the doorway (hold door open). Squirrels can't break doors fast. Wait 24-48 hours until they fall asleep, then hunt them one by one. Or use a molotov.