diff --git a/src/core/GameLoop.js b/src/core/GameLoop.js
index 7c61bf5..47d0fb5 100644
--- a/src/core/GameLoop.js
+++ b/src/core/GameLoop.js
@@ -1131,6 +1131,7 @@ export class GameLoop {
    */
   async startLevel(runData, options = {}) {
     console.log("GameLoop: Generating Level...");
+    console.log(`Level Seed: ${runData.seed}`);
     this.runData = runData;
     this.isRunning = true;
 
@@ -1171,7 +1172,7 @@ export class GameLoop {
     // Restart the animation loop if it was stopped
     this.animate();
 
-    this.grid = new VoxelGrid(20, 10, 20);
+    this.grid = new VoxelGrid(20, 20, 20);
 
     let generator;
     const biomeType = runData.biome?.type || "BIOME_RUSTING_WASTES";
diff --git a/src/core/GameStateManager.js b/src/core/GameStateManager.js
index 86c78be..e6ca712 100644
--- a/src/core/GameStateManager.js
+++ b/src/core/GameStateManager.js
@@ -559,11 +559,10 @@ class GameStateManagerClass {
       // Clear the active run (persistence and memory)
       await this.clearActiveRun();
 
-      // Transition to Main Menu (will show Hub if unlocking conditions met)
-      await this.transitionTo(GameStateManagerClass.STATES.MAIN_MENU);
-
-      // Force a refresh of the Hub screen if it was already open/cached?
-      // The state transition should handle visibility, but we check specific UI updates if needed.
+      // NOTE: We do NOT transition to Main Menu automatically here.
+      // The GameLoop (UI layer) is responsible for showing the Mission Debrief
+      // and then requesting title/hub transition when the user is done.
+      // If we transitioned here, we would rip the UI away before the user saw the results.
     });
   }
 
diff --git a/test/core/GameStateManager.test.js b/test/core/GameStateManager.test.js
index 86bc0cf..8c3183e 100644
--- a/test/core/GameStateManager.test.js
+++ b/test/core/GameStateManager.test.js
@@ -29,6 +29,7 @@ describe("Core: GameStateManager (Singleton)", () => {
       saveHubStash: sinon.stub().resolves(),
       loadUnlocks: sinon.stub().resolves([]),
       saveUnlocks: sinon.stub().resolves(),
+      clearRun: sinon.stub().resolves(),
     };
     // Inject Mock (replacing the real Persistence instance)
     gameStateManager.persistence = mockPersistence;
@@ -127,7 +128,9 @@ describe("Core: GameStateManager (Singleton)", () => {
       className: "Vanguard", // Class name
       classId: "CLASS_VANGUARD",
     };
-    gameStateManager.rosterManager.recruitUnit = sinon.stub().resolves(mockRecruitedUnit);
+    gameStateManager.rosterManager.recruitUnit = sinon
+      .stub()
+      .resolves(mockRecruitedUnit);
     gameStateManager.setGameLoop(mockGameLoop);
     await gameStateManager.init();
 
@@ -137,7 +140,9 @@ describe("Core: GameStateManager (Singleton)", () => {
     mockGameLoop.startLevel = sinon.stub().resolves();
 
     // Await the full async chain
-    await gameStateManager.handleEmbark({ detail: { squad: mockSquad, mode: "SELECT" } });
+    await gameStateManager.handleEmbark({
+      detail: { squad: mockSquad, mode: "SELECT" },
+    });
 
     expect(gameStateManager.currentState).to.equal(
       GameStateManager.STATES.DEPLOYMENT
@@ -156,11 +161,15 @@ describe("Core: GameStateManager (Singleton)", () => {
       className: "Vanguard",
       classId: "CLASS_VANGUARD",
     };
-    gameStateManager.rosterManager.recruitUnit = sinon.stub().resolves(mockRecruitedUnit);
+    gameStateManager.rosterManager.recruitUnit = sinon
+      .stub()
+      .resolves(mockRecruitedUnit);
     gameStateManager.setGameLoop(mockGameLoop);
     await gameStateManager.init();
 
-    const mockSquad = [{ id: "u1", isNew: true, name: "Vanguard", classId: "CLASS_VANGUARD" }];
+    const mockSquad = [
+      { id: "u1", isNew: true, name: "Vanguard", classId: "CLASS_VANGUARD" },
+    ];
     mockGameLoop.startLevel = sinon.stub().resolves();
 
     let eventDispatched = false;
@@ -170,7 +179,9 @@ describe("Core: GameStateManager (Singleton)", () => {
       eventData = e.detail.runData;
     });
 
-    await gameStateManager.handleEmbark({ detail: { squad: mockSquad, mode: "DRAFT" } });
+    await gameStateManager.handleEmbark({
+      detail: { squad: mockSquad, mode: "DRAFT" },
+    });
 
     expect(eventDispatched).to.be.true;
     expect(eventData).to.exist;
@@ -202,7 +213,8 @@ describe("Core: GameStateManager (Singleton)", () => {
     await gameStateManager.init();
 
     expect(mockPersistence.loadCampaign.called).to.be.true;
-    expect(gameStateManager.missionManager.load.calledWith(savedCampaignData)).to.be.true;
+    expect(gameStateManager.missionManager.load.calledWith(savedCampaignData))
+      .to.be.true;
   });
 
   it("CoA 6: init should handle missing campaign data gracefully", async () => {
@@ -221,9 +233,11 @@ describe("Core: GameStateManager (Singleton)", () => {
     mockPersistence.saveCampaign.resetHistory();
 
     // Dispatch campaign-data-changed event
-    window.dispatchEvent(new CustomEvent("campaign-data-changed", {
-      detail: { missionCompleted: "MISSION_TUTORIAL_01" }
-    }));
+    window.dispatchEvent(
+      new CustomEvent("campaign-data-changed", {
+        detail: { missionCompleted: "MISSION_TUTORIAL_01" },
+      })
+    );
 
     // Wait for async save (event listener is synchronous but save is async)
     await new Promise((resolve) => setTimeout(resolve, 50));
@@ -233,4 +247,50 @@ describe("Core: GameStateManager (Singleton)", () => {
     expect(savedData).to.exist;
     expect(savedData.completedMissions).to.be.an("array");
   });
+
+  it("CoA 8: mission-sequence-complete should clear run but NOT transition to MAIN_MENU automatically", async () => {
+    // Setup
+    await gameStateManager.init();
+    gameStateManager.activeRunData = { id: "RUN_123" };
+
+    // Spy on transitionTo
+    const transitionSpy = sinon.spy(gameStateManager, "transitionTo");
+
+    // Dispatch event
+    window.dispatchEvent(
+      new CustomEvent("mission-sequence-complete", {
+        detail: { missionId: "MISSION_TEST" },
+      })
+    );
+
+    // Wait for async listeners
+    await new Promise((resolve) => setTimeout(resolve, 50));
+
+    // Assert: Run should be cleared
+    expect(mockPersistence.clearRun.called).to.be.true;
+    expect(gameStateManager.activeRunData).to.be.null;
+
+    // Assert: Should NOT have transitioned to MAIN_MENU (GameLoop handles this after debrief)
+    const callsToMainMenu = transitionSpy
+      .getCalls()
+      .filter((call) => call.args[0] === GameStateManager.STATES.MAIN_MENU);
+    // Initial init() calls it once, so we check if it was called AGAIN
+    // Actually, checking "called" might be tricky if init() called it.
+    // Let's check call count. init() makes 1 call.
+    // If mission-sequence-complete triggered it, we'd see 2.
+    // But better yet, let's reset history before dispatch.
+
+    transitionSpy.resetHistory();
+
+    // Re-dispatch to be sure we are testing the listener
+    window.dispatchEvent(
+      new CustomEvent("mission-sequence-complete", {
+        detail: { missionId: "MISSION_TEST" },
+      })
+    );
+    await new Promise((resolve) => setTimeout(resolve, 50));
+
+    expect(transitionSpy.calledWith(GameStateManager.STATES.MAIN_MENU)).to.be
+      .false;
+  });
 });