diff --git a/scripts/run/dev.sh b/scripts/run/dev.sh
index f7c51e70..9335a94c 100644
--- a/scripts/run/dev.sh
+++ b/scripts/run/dev.sh
@@ -80,9 +80,35 @@ cmd_test() {
     echo -e "${BLUE}Running vitest (guide)...${NC}"
     pnpm --prefix "$GUIDE_DIR" test || exit_code=$?
 
+    echo ""
+    echo -e "${BLUE}Running stability test (20s game boot)...${NC}"
+    _run_stability_test || exit_code=$?
+
     return $exit_code
 }
 
+_run_stability_test() {
+    # Uses the existing screenshot pipeline to boot the game, navigate to
+    # world_map, wait 20s, and capture a screenshot. If the game crashes
+    # before the screenshot is taken, the test fails.
+    local STABILITY_LOG="$REPO_ROOT/.project/logs/stability_$(date +%Y%m%d_%H%M%S).log"
+    mkdir -p "$(dirname "$STABILITY_LOG")"
+    "$REPO_ROOT/tools/screenshot.sh" "stability_test" "world_map" "20" > "$STABILITY_LOG" 2>&1
+    local RESULT=$?
+    if [ $RESULT -ne 0 ]; then
+        echo -e "${RED}FAIL: Stability test failed (exit code $RESULT)${NC}"
+        tail -10 "$STABILITY_LOG" | grep -E "SCRIPT ERROR|ERROR:" | head -5
+        return 1
+    fi
+    if grep -q "SCREENSHOT_PATH:" "$STABILITY_LOG"; then
+        echo -e "${GREEN}PASS: Game stable for 20s, screenshot captured${NC}"
+        return 0
+    else
+        echo -e "${RED}FAIL: Game ran but no screenshot captured${NC}"
+        return 1
+    fi
+}
+
 cmd_verify() {
     local -a step_names step_times step_results
     local overall_exit=0