diff --git a/binding-mri/binding-util.cpp b/binding-mri/binding-util.cpp
index aa798bc..c85a86a 100644
--- a/binding-mri/binding-util.cpp
+++ b/binding-mri/binding-util.cpp
@@ -237,6 +237,24 @@ rb_get_args(int argc, VALUE *argv, const char *format, ...)
 			break;
 		}
 
+		case 'n' :
+		{
+			if (argI >= argc)
+				break;
+
+			ID *sym = va_arg(ap, ID*);
+
+			VALUE symVal = *arg++;
+
+			if (!SYMBOL_P(symVal))
+				rb_raise(rb_eTypeError, "Argument %d: Expected symbol", argI);
+
+			*sym = SYM2ID(symVal);
+			++argI;
+
+			break;
+		}
+
 		case '|' :
 			opt = true;
 			break;
diff --git a/binding-mri/binding-util.h b/binding-mri/binding-util.h
index ff14af6..d99ce0f 100644
--- a/binding-mri/binding-util.h
+++ b/binding-mri/binding-util.h
@@ -131,7 +131,7 @@ wrapNilProperty(VALUE self, const char *iv)
 	rb_iv_set(self, iv, Qnil);
 }
 
-/* Implemented: oSszfib| */
+/* Implemented: oSszfibn| */
 int
 rb_get_args(int argc, VALUE *argv, const char *format, ...);
 
diff --git a/binding-mri/input-binding.cpp b/binding-mri/input-binding.cpp
index b224da9..6ff3a7c 100644
--- a/binding-mri/input-binding.cpp
+++ b/binding-mri/input-binding.cpp
@@ -33,40 +33,45 @@ RB_METHOD(inputUpdate)
 	return Qnil;
 }
 
+static int getButtonArg(VALUE self, int argc, VALUE *argv)
+{
+	int num;
+
+#ifdef RGSS3
+	ID sym;
+	rb_get_args(argc, argv, "n", &sym RB_ARG_END);
+
+	if (rb_const_defined(self, sym))
+		num = FIX2INT(rb_const_get(self, sym));
+	else
+		num = 0;
+#else
+	(void) self;
+	rb_get_args(argc, argv, "i", &num RB_ARG_END);
+#endif
+
+	return num;
+}
+
 RB_METHOD(inputPress)
 {
-	RB_UNUSED_PARAM;
+	int num = getButtonArg(self, argc, argv);
 
-	int num;
-	rb_get_args(argc, argv, "i", &num RB_ARG_END);
-
-	Input::ButtonCode bc = (Input::ButtonCode) num;
-
-	return rb_bool_new(shState->input().isPressed(bc));
+	return rb_bool_new(shState->input().isPressed(num));
 }
 
 RB_METHOD(inputTrigger)
 {
-	RB_UNUSED_PARAM;
+	int num = getButtonArg(self, argc, argv);
 
-	int num;
-	rb_get_args(argc, argv, "i", &num RB_ARG_END);
-
-	Input::ButtonCode bc = (Input::ButtonCode) num;
-
-	return rb_bool_new(shState->input().isTriggered(bc));
+	return rb_bool_new(shState->input().isTriggered(num));
 }
 
 RB_METHOD(inputRepeat)
 {
-	RB_UNUSED_PARAM;
+	int num = getButtonArg(self, argc, argv);
 
-	int num;
-	rb_get_args(argc, argv, "i", &num RB_ARG_END);
-
-	Input::ButtonCode bc = (Input::ButtonCode) num;
-
-	return rb_bool_new(shState->input().isRepeated(bc));
+	return rb_bool_new(shState->input().isRepeated(num));
 }
 
 RB_METHOD(inputDir4)
diff --git a/binding-mruby/input-binding.cpp b/binding-mruby/input-binding.cpp
index 7231c9b..e415e6f 100644
--- a/binding-mruby/input-binding.cpp
+++ b/binding-mruby/input-binding.cpp
@@ -33,34 +33,44 @@ MRB_FUNCTION(inputUpdate)
 	return mrb_nil_value();
 }
 
-MRB_FUNCTION(inputPress)
+static mrb_int getButtonArg(mrb_state *mrb, mrb_value self)
 {
 	mrb_int num;
+
+#ifdef RGSS3
+	mrb_sym sym;
+	mrb_get_args(mrb, "n", &sym);
+
+	if (mrb_const_defined(mrb, self, sym))
+		num = mrb_fixnum(mrb_const_get(mrb, self, sym));
+	else
+		num = 0;
+#else
 	mrb_get_args(mrb, "i", &num);
+#endif
 
-	Input::ButtonCode bc = (Input::ButtonCode) num;
-
-	return mrb_bool_value(shState->input().isPressed(bc));
+	return num;
 }
 
-MRB_FUNCTION(inputTrigger)
+MRB_METHOD(inputPress)
 {
-	mrb_int num;
-	mrb_get_args(mrb, "i", &num);
+	mrb_int num = getButtonArg(mrb, self);
 
-	Input::ButtonCode bc = (Input::ButtonCode) num;
-
-	return mrb_bool_value(shState->input().isTriggered(bc));
+	return mrb_bool_value(shState->input().isPressed(num));
 }
 
-MRB_FUNCTION(inputRepeat)
+MRB_METHOD(inputTrigger)
 {
-	mrb_int num;
-	mrb_get_args(mrb, "i", &num);
+	mrb_int num = getButtonArg(mrb, self);
 
-	Input::ButtonCode bc = (Input::ButtonCode) num;
+	return mrb_bool_value(shState->input().isTriggered(num));
+}
 
-	return mrb_bool_value(shState->input().isRepeated(bc));
+MRB_METHOD(inputRepeat)
+{
+	mrb_int num = getButtonArg(mrb, self);
+
+	return mrb_bool_value(shState->input().isRepeated(num));
 }
 
 MRB_FUNCTION(inputDir4)