diff --git a/src/components/DevPalette.tsx b/src/components/DevPalette.tsx
index 2186e62..96030ab 100644
--- a/src/components/DevPalette.tsx
+++ b/src/components/DevPalette.tsx
@@ -80,25 +80,18 @@ export function DevPalette() {
           },
         }
       : null
-    // Dev-only "mature island" preview — flips the sparse-by-default
-    // Flowers/Tree/Butterflies views into showAll so we can see what a
-    // saturated island looks like without scripting captures. Toggle off
-    // restores the sparse state (only what the student has actually
-    // earned through captures remains visible).
-    const matureIsland: Command | null = import.meta.env.DEV
-      ? {
-          id: 'mature-island',
-          label: matureIslandOn ? 'Hide mature island' : 'Show mature island',
-          hint: 'dev preview',
-          run: () => {
-            setOpen(false)
-            window.dispatchEvent(
-              new CustomEvent('ss:mature-island-toggle', { detail: { on: !matureIslandOn } }),
-            )
-            setMatureIslandOn((v) => !v)
-          },
-        }
-      : null
+    const matureIsland: Command = {
+      id: 'mature-island',
+      label: matureIslandOn ? 'Hide mature island' : 'Show mature island',
+      hint: 'island preview',
+      run: () => {
+        setOpen(false)
+        window.dispatchEvent(
+          new CustomEvent('ss:mature-island-toggle', { detail: { on: !matureIslandOn } }),
+        )
+        setMatureIslandOn((v) => !v)
+      },
+    }
     return [
       { id: 'ui', label: 'Switch to UI mode', hint: '/', run: go('/') },
       {
@@ -118,7 +111,7 @@ export function DevPalette() {
       },
       ...(cameraTuner ? [cameraTuner] : []),
       ...(hatchTuner ? [hatchTuner] : []),
-      ...(matureIsland ? [matureIsland] : []),
+      matureIsland,
       {
         id: 'restart-onboarding',
         label: 'Restart onboarding',
diff --git a/src/components/student-space/EngineHost.tsx b/src/components/student-space/EngineHost.tsx
index 90da055..445fab0 100644
--- a/src/components/student-space/EngineHost.tsx
+++ b/src/components/student-space/EngineHost.tsx
@@ -279,7 +279,7 @@ export function EngineHost({
         <MoodSheet />
         {showOnboardingFlow ? <OnboardingFlow /> : null}
         {import.meta.env.DEV && game ? <CameraTuneBridge game={game} /> : null}
-        {import.meta.env.DEV && game ? <MatureIslandBridge game={game} /> : null}
+        {game ? <MatureIslandBridge game={game} /> : null}
         {children}
       </EngineOverlayProvider>
     </EngineContext.Provider>
@@ -292,12 +292,6 @@ export function EngineHost({
  * static framing without a remount. The HUD itself is hidden until the
  * palette dispatches CAMERA_TUNER_OPEN_EVENT.
  */
-/**
- * DEV-only bridge: listens for the dev palette's `ss:mature-island-toggle`
- * event and flips the sparse-by-default Flowers / Tree / Butterflies views
- * into showAll (or back to hidden — only what the student has earned by
- * capturing stays visible).
- */
 function MatureIslandBridge({ game }: { game: Game }) {
   useEffect(() => {
     const view = (
diff --git a/test/components/DevPalette.test.tsx b/test/components/DevPalette.test.tsx
index 80d2f0b..f985dcc 100644
--- a/test/components/DevPalette.test.tsx
+++ b/test/components/DevPalette.test.tsx
@@ -63,7 +63,9 @@ beforeEach(() => {
 
 afterEach(() => {
   document.body.classList.remove('is-dev-overlay-hidden')
+  document.body.classList.remove('is-world-controls-visible')
   navigate.mockClear()
+  vi.unstubAllEnvs()
   Object.defineProperty(window.location, 'assign', {
     configurable: true,
     writable: true,
@@ -117,14 +119,35 @@ describe('DevPalette', () => {
     render(<DevPalette />)
     await user.keyboard('{Meta>}k{/Meta}')
 
+    await user.click(screen.getByRole('option', { name: /show world controls/i }))
+    expect(document.body).toHaveClass('is-world-controls-visible')
+    expect(localStorage.getItem('sm:world-controls-visible')).toBe('1')
+
+    await user.keyboard('{Meta>}k{/Meta}')
     await user.click(screen.getByRole('option', { name: /hide world controls/i }))
-    expect(document.body).toHaveClass('is-dev-overlay-hidden')
-    expect(localStorage.getItem('sm:dev-overlay-hidden')).toBe('1')
+    expect(document.body).not.toHaveClass('is-world-controls-visible')
+    expect(localStorage.getItem('sm:world-controls-visible')).toBeNull()
+  })
+
+  it('keeps mature island preview available in production builds', async () => {
+    vi.stubEnv('DEV', false)
+    const user = userEvent.setup()
+    const matureIslandListener = vi.fn()
+    window.addEventListener('ss:mature-island-toggle', matureIslandListener)
+    render(<DevPalette />)
 
     await user.keyboard('{Meta>}k{/Meta}')
-    await user.click(screen.getByRole('option', { name: /show world controls/i }))
-    expect(document.body).not.toHaveClass('is-dev-overlay-hidden')
-    expect(localStorage.getItem('sm:dev-overlay-hidden')).toBeNull()
+    expect(screen.getByRole('option', { name: /show mature island/i })).toBeInTheDocument()
+    expect(screen.queryByRole('option', { name: /show camera tuner/i })).not.toBeInTheDocument()
+    expect(screen.queryByRole('option', { name: /show hatch tuner/i })).not.toBeInTheDocument()
+
+    await user.click(screen.getByRole('option', { name: /show mature island/i }))
+    expect(matureIslandListener).toHaveBeenCalledTimes(1)
+    expect(matureIslandListener.mock.calls[0]?.[0]).toMatchObject({
+      detail: { on: true },
+    })
+
+    window.removeEventListener('ss:mature-island-toggle', matureIslandListener)
   })
 
   it('restarts onboarding from Cmd-K without clearing the full student-space state', async () => {