diff --git a/assets/locales/en/terrarum_sentences.json b/assets/locales/en/terrarum_sentences.json
index 8022748b8..32505efef 100644
--- a/assets/locales/en/terrarum_sentences.json
+++ b/assets/locales/en/terrarum_sentences.json
@@ -1,5 +1,6 @@
 {
   "ERROR_FILE_NOT_FOUND": "File not found.",
+  "ERROR_SAVE_IS_FROM_NEWER_VERSION": "Saved game is newer than the current game version.",
   "GAME_32BIT_WARNING1": "It looks like you’re running a 32-Bit version of Java.",
   "GAME_32BIT_WARNING2": "Please download and install the latest 64-Bit Java at:",
   "GAME_32BIT_WARNING3": "https://www.java.com/en/download/",
diff --git a/assets/locales/koKR/terrarum_sentences.json b/assets/locales/koKR/terrarum_sentences.json
index 544fc2500..ccde55552 100644
--- a/assets/locales/koKR/terrarum_sentences.json
+++ b/assets/locales/koKR/terrarum_sentences.json
@@ -1,5 +1,6 @@
 {
   "ERROR_FILE_NOT_FOUND": "파일을 찾을 수 없습니다.",
+  "ERROR_SAVE_IS_FROM_NEWER_VERSION": "저장된 게임이 현재 게임보다 더 최신입니다.",
   "GAME_32BIT_WARNING1": "32비트 버전의 Java를 사용중인 것 같습니다.",
   "GAME_32BIT_WARNING2": "아래 링크에서 최신 64비트 Java를 내려받아 설치해주세요.",
   "GAME_32BIT_WARNING3": "https://www.java.com/ko/download/",
diff --git a/src/net/torvald/terrarum/TerrarumAppConfiguration.kt b/src/net/torvald/terrarum/TerrarumAppConfiguration.kt
index 388399f3a..59cb67d25 100644
--- a/src/net/torvald/terrarum/TerrarumAppConfiguration.kt
+++ b/src/net/torvald/terrarum/TerrarumAppConfiguration.kt
@@ -115,4 +115,8 @@ data class Snapshot(var revision: Int) {
         revision = (b[0].toUint() ushr 7 shl 2) or b[1].toUint().and(3)
         update()
     }
+
+    override fun hashCode(): Int {
+        return year.shl(24) or week.shl(16) or revision
+    }
 }
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UILoadDemoSavefiles.kt b/src/net/torvald/terrarum/modulebasegame/ui/UILoadDemoSavefiles.kt
index 08fd2f978..4549a5d1f 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UILoadDemoSavefiles.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UILoadDemoSavefiles.kt
@@ -37,6 +37,7 @@ import net.torvald.terrarum.ui.UIItem
 import net.torvald.terrarum.utils.JsonFetcher
 import net.torvald.terrarum.utils.forEachSiblings
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
+import java.math.BigInteger
 import java.time.Instant
 import java.time.format.DateTimeFormatter
 import java.util.*
@@ -508,6 +509,7 @@ class UIItemPlayerCells(
     private var lastPlayTime: String = "????-??-?? --:--:--"
     private var totalPlayTime: String = "--h--m--s"
     private var versionString: String = "0.0.0"
+    var isNewerVersion = false; private set
 
 //    lateinit var playerUUID: UUID; private set
     lateinit var worldUUID: UUID; private set
@@ -526,18 +528,29 @@ class UIItemPlayerCells(
         loadable.rebuild()
         loadable.getFile(SAVEGAMEINFO)?.bytes?.let {
             var lastPlayTime0 = 0L
+            var genverLong = 0L
             var genver = ""
 
             JsonFetcher.readFromJsonString(ByteArray64Reader(it, Common.CHARSET)).forEachSiblings { name, value ->
                 if (name == "worldCurrentlyPlaying") worldUUID = UUID.fromString(value.asString())
                 if (name == "totalPlayTime") totalPlayTime = parseDuration(value.asLong())
                 if (name == "lastPlayTime") lastPlayTime0 = value.asLong()
-                if (name == "genver") genver = value.asLong().let { "${it.ushr(48)}.${it.ushr(24).and(0xFFFFFF)}.${it.and(0xFFFFFF)}" }
+                if (name == "genver") {
+                    genverLong = value.asLong()
+                    genver = genverLong.let { "${it.ushr(48)}.${it.ushr(24).and(0xFFFFFF)}.${it.and(0xFFFFFF)}" }
+                }
             }
 
             val snap = loadable.getSaveSnapshotVersion()
             versionString = genver + (if (snap != null) "-$snap" else "")
 
+            val savegameVersionNum = // 0x GGGG GGGGGG GGGGGG YY WW RR
+                BigInteger(genverLong.toString()) * BigInteger("16777216") + BigInteger(snap?.hashCode()?.toString() ?: "16777215")
+            val thisVersionNum =
+                BigInteger(TerrarumAppConfiguration.VERSION_RAW.toString()) * BigInteger("16777216") + BigInteger(TerrarumAppConfiguration.VERSION_SNAPSHOT?.hashCode()?.toString() ?: "16777215")
+
+            isNewerVersion = (savegameVersionNum > thisVersionNum)
+
             App.savegamePlayersName[playerUUID]?.let { if (it.isNotBlank()) playerName = it else "(name)" }
             App.savegameWorldsName[worldUUID]?.let { if (it.isNotBlank()) worldName = it }
             lastPlayTime = Instant.ofEpochSecond(lastPlayTime0)
@@ -617,12 +630,14 @@ class UIItemPlayerCells(
         Toolkit.drawBoxBorder(batch, x + avatarViewWidth + 9, y - 1, width - avatarViewWidth - 8, height + 2)
 
         // texts
+        batch.color = if (isNewerVersion) Toolkit.Theme.COL_RED else highlightTextCol
+        App.fontGame.draw(batch, versionString, x + avatarViewWidth + 40f, line4)
+
         batch.color = highlightTextCol
         val playTimeTextLen = App.fontGame.getWidth(totalPlayTime)
         App.fontGame.draw(batch, playerName, x + avatarViewWidth + 40f, line1)
         App.fontGame.draw(batch, worldName, x + avatarViewWidth + 40f, line2)
         App.fontGame.draw(batch, lastPlayTime, x + avatarViewWidth + 40f, line3)
-        App.fontGame.draw(batch, versionString, x + avatarViewWidth + 40f, line4)
         App.fontGame.draw(batch, totalPlayTime, x + width - 5f - playTimeTextLen, line4)
         // icons
         batch.draw(icons.get(24,0), x + avatarViewWidth + 14f - 0, line1 + 2f) // player name
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UILoadManage.kt b/src/net/torvald/terrarum/modulebasegame/ui/UILoadManage.kt
index 04349cda9..7738657c4 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UILoadManage.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UILoadManage.kt
@@ -92,6 +92,21 @@ class UILoadManage(val full: UILoadSavegame) : UICanvas() {
         { Lang["ERROR_SAVE_CORRUPTED"].replace(".","") }, buttonX1third, buttonRowY2, buttonWidth * 3 + buttonGap * 2, alignment = UIItemTextButton.Companion.Alignment.CENTRE, hasBorder = true).also {
         it.isEnabled = false
     }
+    private val mainNoGoButtonSaveFromNewerVersion = UIItemTextButton(this,
+        { if (altDown && savegameIsNotNew) Lang["MENU_LABEL_PREV_SAVES"] else Lang["ERROR_SAVE_IS_FROM_NEWER_VERSION"].replace(".","") }, buttonX1third, buttonRowY2, buttonWidth * 3 + buttonGap * 2, alignment = UIItemTextButton.Companion.Alignment.CENTRE, hasBorder = true).also {
+        it.isEnabled = false
+        it.clickOnceListener = { _,_ ->
+            App.printdbg(this, "Load playerUUID: ${UILoadGovernor.playerUUID}, worldUUID: ${UILoadGovernor.worldUUID}")
+
+            if (altDown && savegameIsNotNew) {
+                mode = MODE_PREV_SAVES
+                loadPrevGameInfo()
+            }
+        }
+        it.updateListener = { _ ->
+            it.isEnabled = altDown
+        }
+    }
     private val mainImportedPlayerCreateNewWorldButton = UIItemTextButton(this,
         { Lang["CONTEXT_WORLD_NEW"].replace(".","") }, buttonX1third, buttonRowY2, buttonWidth * 3 + buttonGap * 2, alignment = UIItemTextButton.Companion.Alignment.CENTRE, hasBorder = true).also {
         it.clickOnceListener = { _,_ ->
@@ -179,7 +194,8 @@ class UILoadManage(val full: UILoadSavegame) : UICanvas() {
     private var mode = 0
 
     private var mainButtons0 = listOf(mainGoButton, mainBackButton, mainRenameButton, mainDeleteButton)
-    private var mainButtons1 = listOf(mainNoGoButton, mainBackButton, mainRenameButton, mainDeleteButton)
+    private var mainButtonsNoGoSaveCorrupted = listOf(mainNoGoButton, mainBackButton, mainRenameButton, mainDeleteButton)
+    private var mainButtonsNoGoSaveFromNewer = listOf(mainNoGoButtonSaveFromNewerVersion, mainBackButton, mainRenameButton, mainDeleteButton)
     private var mainButtons2 = listOf(mainImportedPlayerCreateNewWorldButton, mainBackButton, mainRenameButton, mainDeleteButton)
     private var delButtons = listOf(confirmCancelButton, confirmDeleteButton)
     private var renameButtons = listOf(renameRenameButton, renameCancelButton)
@@ -190,7 +206,15 @@ class UILoadManage(val full: UILoadSavegame) : UICanvas() {
         get() = full.loadables.saveAvaliable()
 
     private val mainButtons: List<UIItemTextButton>
-        get() = if (full.loadables.saveAvaliable()) mainButtons0 else if (full.loadables.isImported) mainButtons2 else mainButtons1
+        get() =
+        if (full.playerButtonSelected?.isNewerVersion == true)
+            mainButtonsNoGoSaveFromNewer
+        else if (full.loadables.saveAvaliable())
+            mainButtons0
+        else if (full.loadables.isImported)
+            mainButtons2
+        else
+            mainButtonsNoGoSaveCorrupted
 
     private val MODE_INIT = 0
     private val MODE_DELETE = 16 // are you sure?