diff --git a/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/RDLevel.kt b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/RDLevel.kt
index d48bade..52660de 100644
--- a/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/RDLevel.kt
+++ b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/RDLevel.kt
@@ -1,7 +1,11 @@
+@file:JvmName("RDLevels")
+
 package cn.rdlevel.rdkt.core
 
+import cn.rdlevel.rdkt.core.annotations.RDKTExperimentalAPI
 import cn.rdlevel.rdkt.core.settings.LevelSettings
 import kotlinx.serialization.Serializable
+import kotlin.jvm.JvmName
 
 /**
  * A Rhythm Doctor custom level representation.
@@ -10,5 +14,11 @@ import kotlinx.serialization.Serializable
 public data class RDLevel(
     public val settings: LevelSettings,
 ) {
+}
 
-}
\ No newline at end of file
+/**
+ * Allows using levels with versions other than [LevelSettings.CURRENT_LEVEL_VERSION].
+ * It is not recommended to use this unless you know what you are doing, as it may cause unexpected behavior and this library may not be compatible with levels with other versions.
+ */
+@RDKTExperimentalAPI
+public var allowOldLevels: Boolean = false
\ No newline at end of file
diff --git a/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/settings/LevelSettings.kt b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/settings/LevelSettings.kt
index cf6b12b..476c796 100644
--- a/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/settings/LevelSettings.kt
+++ b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/settings/LevelSettings.kt
@@ -2,11 +2,11 @@
 
 package cn.rdlevel.rdkt.core.settings
 
+import cn.rdlevel.rdkt.core.allowOldLevels
 import cn.rdlevel.rdkt.core.annotations.RDKTExperimentalAPI
 import cn.rdlevel.rdkt.core.annotations.RDKTInternalAPI
 import cn.rdlevel.rdkt.core.serialization.MutableStringListSerializedInString
 import cn.rdlevel.rdkt.core.settings.LevelSettings.Companion.CURRENT_LEVEL_VERSION
-import cn.rdlevel.rdkt.core.settings.LevelSettings.Companion.allowOldLevels
 import kotlinx.serialization.Serializable
 import kotlin.jvm.JvmName
 import kotlin.random.Random
@@ -207,13 +207,6 @@ public class LevelSettings {
          * The current level version the level editor is using.
          */
         public const val CURRENT_LEVEL_VERSION: Int = 67
-
-        /**
-         * Allows using levels with versions other than [CURRENT_LEVEL_VERSION].
-         * It is not recommended to use this unless you know what you are doing, as it may cause unexpected behavior and this library may not be compatible with levels with other versions.
-         */
-        @RDKTExperimentalAPI
-        public var allowOldLevels: Boolean = false
     }
 }