diff --git a/extensions/game/2048/2048.c b/extensions/game/2048/2048.c
index fedf291..c29deac 100644
--- a/extensions/game/2048/2048.c
+++ b/extensions/game/2048/2048.c
@@ -24,7 +24,7 @@ Shell *shell2048 = NULL;
 
 char shellGetChar(Shell *shell) {
     char data;
-    if (shell->read(&data, 1) == 1) {
+    if (shell->read && shell->read(&data, 1) == 1) {
         return data;
     } else {
         return -1;
@@ -421,5 +421,3 @@ int main_2048(int argc, char *argv[]) {
 
 	return EXIT_SUCCESS;
 }
-SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN),
-2048, main_2048, game 2048\n2048 [param]\nParam: blackwhite bluered or null);
diff --git a/extensions/game/game.c b/extensions/game/game.c
index 4188f1f..3452215 100644
--- a/extensions/game/game.c
+++ b/extensions/game/game.c
@@ -22,4 +22,6 @@ ShellCommand gameGroup[] =
         pushbox, main_pushbox, game pushbox),
     SHELL_CMD_GROUP_END()
 };
-SHELL_EXPORT_CMD_GROUP(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN), game, gameGroup, games);
+SHELL_EXPORT_CMD_GROUP(
+SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN)|SHELL_CMD_DISABLE_RETURN,
+game, gameGroup, games);
diff --git a/extensions/game/pushbox/pushbox.c b/extensions/game/pushbox/pushbox.c
index 661e5ca..5d41c3d 100644
--- a/extensions/game/pushbox/pushbox.c
+++ b/extensions/game/pushbox/pushbox.c
@@ -14,7 +14,7 @@ Shell *shellPushbox = NULL;
 
 static char shellGetChar(Shell *shell) {
     char data;
-    if (shell->read(&data, 1) == 1) {
+    if (shell->read && shell->read(&data, 1) == 1) {
         return data;
     } else {
         return -1;