diff --git a/src/packages/guide/src/components/climate-sim/ClimateSimDisplay.tsx b/src/packages/guide/src/components/climate-sim/ClimateSimDisplay.tsx
index ae1f5f0e..a99a138f 100644
--- a/src/packages/guide/src/components/climate-sim/ClimateSimDisplay.tsx
+++ b/src/packages/guide/src/components/climate-sim/ClimateSimDisplay.tsx
@@ -10,7 +10,7 @@ import {
   CANVAS_W, CANVAS_H,
   DEFAULT_SCENARIO_TURNS, EXTEND_TURNS, FRAME_MS, DEFAULT_BUFFER_SECONDS,
 } from '@magic-civ/engine-ts'
-import { useSimulationWorker } from '@/hooks/useSimulationWorker'
+import type { UseSimulationWorkerResult } from '../../types/simulation'
 import { HexGLRenderer } from './HexGLRenderer'
 import { LayerPanel, ENVIRONMENT_DEFAULT_MASK, LIFE_DEFAULT_MASK } from './LayerPanel'
 import type { SimCategory } from './LayerPanel'
@@ -93,9 +93,10 @@ function frameAsSnapshot(frame: FramePayload, stats?: { avg_moisture: number; to
 
 interface ClimateSimDisplayProps {
   easterEggs?: Record<string, EasterEggSeed>
+  simulation: UseSimulationWorkerResult
 }
 
-export function ClimateSimDisplay({ easterEggs }: ClimateSimDisplayProps): ReactElement {
+export function ClimateSimDisplay({ easterEggs, simulation }: ClimateSimDisplayProps): ReactElement {
   const [searchParams, setSearchParams] = useSearchParams()
 
   // ── URL state ──────────────────────────────────────────────────────────
@@ -183,7 +184,7 @@ export function ClimateSimDisplay({ easterEggs }: ClimateSimDisplayProps): React
     return () => document.removeEventListener('mousedown', onDown)
   }, [planetOpen])
 
-  // ── worker hook ────────────────────────────────────────────────────────
+  // ── simulation (provided by consumer) ──────────────────────────────────
   const {
     scenarios: workerScenarios,
     currentFrame,
@@ -195,7 +196,7 @@ export function ClimateSimDisplay({ easterEggs }: ClimateSimDisplayProps): React
     requestFrame,
     cancelScenario,
     triggerEvent,
-  } = useSimulationWorker()
+  } = simulation
 
   // ── kick off simulation when worker is ready or scenario changes ──────
   // NOTE: workerScenarios is intentionally NOT in this dep array — it updates on every