diff --git a/src/web/client/typing_practice.html b/src/web/client/typing_practice.html
index 4a74b97..e1f4f30 100644
--- a/src/web/client/typing_practice.html
+++ b/src/web/client/typing_practice.html
@@ -16,7 +16,7 @@
 		<script src="../../game/global/global_variables.js"></script>
 
 		<!-- library source files -->
-		<script src="../../game/lib/keyboard_shortcut.js"></script>
+		<!-- <script src="../../game/lib/keyboard_shortcut.js"></script> -->
 		<script src="../../game/lib/string_util.js"></script>
 		<script src="../../game/lib/number_util.js"></script>
 		<script src="../../game/lib/history_record_manager.js"></script>
diff --git a/src/web/client/typing_test.html b/src/web/client/typing_test.html
index 6183088..68e9ea8 100644
--- a/src/web/client/typing_test.html
+++ b/src/web/client/typing_test.html
@@ -16,7 +16,7 @@
 		<script src="../../game/global/global_variables.js"></script>
 
 		<!-- library source files -->
-		<!-- <script src="../../game/lib/keyboard_shortcut.js"></script> -->
+		<script src="../../game/lib/keyboard_shortcut.js"></script>
 		<script src="../../game/lib/string_util.js"></script>
 		<script src="../../game/lib/number_util.js"></script>
 		<script src="../../game/lib/history_record_manager.js"></script>
diff --git a/src/web/client/whac_a_mole.html b/src/web/client/whac_a_mole.html
index ccf0021..6246d5b 100644
--- a/src/web/client/whac_a_mole.html
+++ b/src/web/client/whac_a_mole.html
@@ -16,7 +16,7 @@
 		<script src="../../game/global/global_variables.js"></script>
 
 		<!-- library source files -->
-		<script src="../../game/lib/keyboard_shortcut.js"></script>
+		<!-- <script src="../../game/lib/keyboard_shortcut.js"></script> -->
 		<script src="../../game/lib/string_util.js"></script>
 		<script src="../../game/lib/number_util.js"></script>
 		<script src="../../game/lib/history_record_manager.js"></script>