diff --git a/tools/ai-arena.sh b/tools/ai-arena.sh
index 57540b66..ad61cc0a 100755
--- a/tools/ai-arena.sh
+++ b/tools/ai-arena.sh
@@ -181,6 +181,7 @@ for ((i = 0; i < N; i++)); do
         org.godotengine.Godot \
         --path "$GAME_DIR" \
         --rendering-method gl_compatibility \
+        --windowed \
         --resolution "${CELL_W}x${CELL_H}" \
         --position "${POS_X},${POS_Y}" \
         >"$RESULTS_DIR/${MATCH_ID}.log" 2>&1 &