diff --git a/tools/build_release.ps1 b/tools/build_release.ps1
index 8be0856..aecbde0 100644
--- a/tools/build_release.ps1
+++ b/tools/build_release.ps1
@@ -1,4 +1,4 @@
-$ErrorActionPreference = "Stop"
+$ErrorActionPreference = "Stop"
 
 $root = Split-Path -Parent $PSScriptRoot
 $dotnet = "C:\Program Files\dotnet\dotnet.exe"
@@ -153,5 +153,290 @@ if ($gp) {
 Write-Host ''
 '@ | Set-Content (Join-Path $zipStageRoot "helper.ps1") -Encoding UTF8
 
+# Generate save-copy launcher
+@'
+@echo off
+powershell -NoProfile -ExecutionPolicy Bypass -File "%~dp0copy_save_helper.ps1"
+pause
+'@ | Set-Content (Join-Path $zipStageRoot "CopySave.bat") -Encoding ASCII
+
+# Generate save-copy helper script
+@'
+[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
+$host.UI.RawUI.WindowTitle = 'STS2 Save Copy Tool'
+
+# ── Helpers ─────────────────────────────────────────────────────────
+function Write-Bi($en, $zh, $color) {
+    if ($color) { Write-Host "  $en | $zh" -ForegroundColor $color }
+    else        { Write-Host "  $en | $zh" }
+}
+
+function Read-Choice($prompt) {
+    Write-Host ''
+    Write-Host "  $prompt" -ForegroundColor White -NoNewline
+    $val = Read-Host
+    if ($null -eq $val) { return '' }
+    return $val.Trim()
+}
+
+# ── Constants ───────────────────────────────────────────────────────
+$SAVE_ROOT = Join-Path $env:APPDATA 'SlayTheSpire2\steam'
+
+Write-Host '============================================'
+Write-Host '  Copy Vanilla Save to Modded'
+Write-Host '  复制原版存档到模组存档'
+Write-Host '============================================'
+Write-Host ''
+
+# ── Locate save root ────────────────────────────────────────────────
+if (-not (Test-Path $SAVE_ROOT)) {
+    Write-Bi 'Save directory not found.' '未找到存档目录。' Red
+    Write-Bi 'Please launch the game at least once first.' '请先至少启动一次游戏。' $null
+    Write-Host "  $SAVE_ROOT"
+    exit 1
+}
+
+# ── Detect Steam ID ─────────────────────────────────────────────────
+$ids = @(Get-ChildItem $SAVE_ROOT -Directory | Where-Object { $_.Name -match '^\d+$' } | Select-Object -ExpandProperty Name)
+if ($ids.Count -eq 0) {
+    Write-Bi 'No Steam user saves found.' '未找到任何 Steam 用户存档。' Red
+    exit 1
+}
+
+$steamId = $ids[0]
+if ($ids.Count -gt 1) {
+    Write-Bi 'Multiple Steam accounts detected:' '检测到多个 Steam 账号：' $null
+    Write-Host ''
+    for ($i = 0; $i -lt $ids.Count; $i++) {
+        Write-Host "    $($i+1). $($ids[$i])"
+    }
+    $pick = Read-Choice "Select account | 请选择账号 [1-$($ids.Count)]: "
+    $idx = [int]$pick - 1
+    if ($idx -ge 0 -and $idx -lt $ids.Count) { $steamId = $ids[$idx] }
+    else { Write-Bi 'Invalid selection.' '无效选择。' Red; exit 1 }
+}
+
+Write-Host "  Steam ID: $steamId" -ForegroundColor Cyan
+Write-Host ''
+
+# ── Profile info helper ─────────────────────────────────────────────
+function Get-ProfileInfo($sid, $type, $slot) {
+    $base = if ($type -eq 'normal') {
+        Join-Path $SAVE_ROOT "$sid\profile$slot\saves"
+    } else {
+        Join-Path $SAVE_ROOT "$sid\modded\profile$slot\saves"
+    }
+    $progressFile = Join-Path $base 'progress.save'
+    $hasData = Test-Path $progressFile
+    $lastModified = $null
+    if ($hasData) { $lastModified = (Get-Item $progressFile).LastWriteTime }
+    return @{ Path = $base; HasData = $hasData; LastModified = $lastModified; Slot = $slot }
+}
+
+# ── Backup helper ────────────────────────────────────────────────────
+function Do-Backup($sid, $type, $tag, $slot) {
+    $src = if ($type -eq 'normal') {
+        Join-Path $SAVE_ROOT "$sid\profile$slot\saves"
+    } else {
+        Join-Path $SAVE_ROOT "$sid\modded\profile$slot\saves"
+    }
+    if (-not (Test-Path $src)) { return }
+
+    $timestamp = Get-Date -Format 'yyyyMMdd_HHmmss'
+    $backupDir = Join-Path $SAVE_ROOT "$sid\backups\${type}_p${slot}_${tag}_$timestamp"
+    New-Item $backupDir -ItemType Directory -Force | Out-Null
+
+    $files = Get-ChildItem $src -File -ErrorAction SilentlyContinue
+    foreach ($f in $files) { Copy-Item $f.FullName (Join-Path $backupDir $f.Name) -Force }
+
+    # Also backup history/ subdirectory
+    $histDir = Join-Path $src 'history'
+    if (Test-Path $histDir) {
+        $bkHist = Join-Path $backupDir 'history'
+        Copy-Item $histDir $bkHist -Recurse -Force
+    }
+
+    $label = if ($type -eq 'normal') { 'vanilla | 原版' } else { 'modded | 模组' }
+    if ($files.Count -gt 0) {
+        Write-Host "  [OK] Backed up $label slot $slot ($($files.Count) files)" -ForegroundColor Green
+        Write-Host "  [OK] 已备份${label}槽位$slot ($($files.Count) 个文件)" -ForegroundColor Green
+        Write-Host "       $backupDir" -ForegroundColor DarkGray
+    }
+
+    # Prune: keep max 20 backups per type
+    $backupRoot = Join-Path $SAVE_ROOT "$sid\backups"
+    if (Test-Path $backupRoot) {
+        $typeBackups = Get-ChildItem $backupRoot -Directory |
+            Where-Object { $_.Name -like "${type}_*" } |
+            Sort-Object Name -Descending
+        if ($typeBackups.Count -gt 20) {
+            $typeBackups | Select-Object -Skip 20 | ForEach-Object {
+                Remove-Item $_.FullName -Recurse -Force -ErrorAction SilentlyContinue
+            }
+        }
+    }
+}
+
+# ── Scan profiles ────────────────────────────────────────────────────
+$normalInfos = @()
+$moddedInfos = @()
+for ($i = 1; $i -le 3; $i++) {
+    $normalInfos += Get-ProfileInfo $steamId 'normal' $i
+    $moddedInfos += Get-ProfileInfo $steamId 'modded' $i
+}
+
+# Check if any vanilla profile has data
+$hasAnyNormal = $false
+for ($i = 0; $i -lt 3; $i++) {
+    if ($normalInfos[$i].HasData) { $hasAnyNormal = $true; break }
+}
+if (-not $hasAnyNormal) {
+    Write-Bi 'No vanilla saves found. Please play the game without mods first.' '没有可复制的原版存档。请先运行一次原版游戏。' Red
+    exit 1
+}
+
+# Auto-select: source = first non-empty vanilla, dest = first empty modded (or slot 1)
+$srcSlot = 0
+for ($i = 0; $i -lt 3; $i++) {
+    if ($normalInfos[$i].HasData) { $srcSlot = $i + 1; break }
+}
+$dstSlot = 0
+for ($i = 0; $i -lt 3; $i++) {
+    if (-not $moddedInfos[$i].HasData) { $dstSlot = $i + 1; break }
+}
+if ($dstSlot -eq 0) { $dstSlot = 1 }
+
+# ── Interactive selection loop ───────────────────────────────────────
+while ($true) {
+    Write-Host '  [Vanilla Saves - Source | 原版存档 - 来源]' -ForegroundColor Green
+    for ($i = 0; $i -lt 3; $i++) {
+        $p = $normalInfos[$i]
+        $arrow = if ($i + 1 -eq $srcSlot) { ' << Source | 来源' } else { '' }
+        $slotLabel = "Slot $($i+1) | 槽位$($i+1)"
+        if ($p.HasData) {
+            $ts = $p.LastModified.ToString('yyyy-MM-dd HH:mm')
+            Write-Host "    ${slotLabel}: $ts" -ForegroundColor Green -NoNewline
+            if ($arrow) { Write-Host $arrow -ForegroundColor Cyan } else { Write-Host '' }
+        } else {
+            Write-Host "    ${slotLabel}: (empty) | (空)" -ForegroundColor DarkGray
+        }
+    }
+
+    Write-Host ''
+
+    Write-Host '  [Modded Saves - Destination | 模组存档 - 目标]' -ForegroundColor Yellow
+    for ($i = 0; $i -lt 3; $i++) {
+        $p = $moddedInfos[$i]
+        $arrow = if ($i + 1 -eq $dstSlot) { ' << Destination | 目标' } else { '' }
+        $slotLabel = "Slot $($i+1) | 槽位$($i+1)"
+        if ($p.HasData) {
+            $ts = $p.LastModified.ToString('yyyy-MM-dd HH:mm')
+            Write-Host "    ${slotLabel}: $ts" -ForegroundColor Yellow -NoNewline
+            if ($arrow) { Write-Host $arrow -ForegroundColor Cyan } else { Write-Host '' }
+        } else {
+            Write-Host "    ${slotLabel}: (empty) | (空)" -ForegroundColor DarkGray -NoNewline
+            if ($arrow) { Write-Host $arrow -ForegroundColor Cyan } else { Write-Host '' }
+        }
+    }
+
+    Write-Host ''
+    Write-Host '  ─────────────────────────────────────' -ForegroundColor DarkGray
+    $dstNote = ''
+    if ($moddedInfos[$dstSlot-1].HasData) { $dstNote = ' (will overwrite, auto-backup | 将覆盖，自动备份)' }
+    Write-Host "  Plan | 计划: Vanilla Slot $srcSlot -> Modded Slot $dstSlot$dstNote" -ForegroundColor Cyan
+    Write-Host ''
+    Write-Host "    S. Change source slot | 更改来源槽位 (current | 当前: $srcSlot)"
+    Write-Host "    D. Change destination slot | 更改目标槽位 (current | 当前: $dstSlot)"
+    Write-Host '    Y. Confirm | 确认执行' -ForegroundColor Cyan
+    Write-Host '    0. Cancel | 取消' -ForegroundColor DarkGray
+
+    $choice = Read-Choice 'Select | 请选择 [S/D/Y/0]: '
+
+    if ($choice -eq '0') { Write-Bi 'Cancelled.' '已取消。' $null; exit 0 }
+    if ($choice -ieq 'Y') { break }
+
+    if ($choice -ieq 'S') {
+        $pick = Read-Choice 'Select source slot | 选择来源槽位 [1-3]: '
+        $idx = [int]$pick
+        if ($idx -ge 1 -and $idx -le 3) {
+            if ($normalInfos[$idx-1].HasData) {
+                $srcSlot = $idx
+                Write-Bi "Source changed to: Vanilla Slot $srcSlot" "来源已更改为: 原版槽位$srcSlot" Green
+            } else {
+                Write-Bi "Vanilla Slot $idx is empty, cannot use as source." "原版槽位$idx 是空的，无法作为来源。" Yellow
+            }
+        } else {
+            Write-Bi 'Please enter 1-3.' '请输入 1-3。' Yellow
+        }
+        continue
+    }
+
+    if ($choice -ieq 'D') {
+        $pick = Read-Choice 'Select destination slot | 选择目标槽位 [1-3]: '
+        $idx = [int]$pick
+        if ($idx -ge 1 -and $idx -le 3) {
+            $dstSlot = $idx
+            if ($moddedInfos[$idx-1].HasData) {
+                Write-Bi "Modded Slot $idx has data - will auto-backup before overwriting." "模组槽位$idx 已有存档，执行时将自动备份后覆盖。" Yellow
+            }
+            Write-Bi "Destination changed to: Modded Slot $dstSlot" "目标已更改为: 模组槽位$dstSlot" Green
+        } else {
+            Write-Bi 'Please enter 1-3.' '请输入 1-3。' Yellow
+        }
+        continue
+    }
+}
+
+# ── Execute copy ─────────────────────────────────────────────────────
+$src = $normalInfos[$srcSlot-1].Path
+$dst = $moddedInfos[$dstSlot-1].Path
+
+Write-Host ''
+
+# Backup if target has data
+if ($moddedInfos[$dstSlot-1].HasData) {
+    Write-Bi "Backing up Modded Slot $dstSlot before overwriting..." "正在备份模组槽位$dstSlot 的现有存档..." $null
+    Do-Backup $steamId 'modded' 'auto_before_copy' $dstSlot
+    Write-Host ''
+}
+
+# Create target directory
+if (-not (Test-Path $dst)) {
+    New-Item $dst -ItemType Directory -Force | Out-Null
+}
+
+# Copy files
+$copied = 0
+$srcFiles = Get-ChildItem $src -File -ErrorAction SilentlyContinue
+foreach ($f in $srcFiles) {
+    Copy-Item $f.FullName (Join-Path $dst $f.Name) -Force
+    Write-Host "    [OK] $($f.Name)" -ForegroundColor Green
+    $copied++
+}
+
+# Copy subdirectories (e.g. history/)
+$srcDirs = Get-ChildItem $src -Directory -ErrorAction SilentlyContinue
+foreach ($d in $srcDirs) {
+    $dstSubDir = Join-Path $dst $d.Name
+    Copy-Item $d.FullName $dstSubDir -Recurse -Force
+    $subCount = (Get-ChildItem $d.FullName -File -Recurse).Count
+    Write-Host "    [OK] $($d.Name)/ ($subCount files | 个文件)" -ForegroundColor Green
+    $copied += $subCount
+}
+
+Write-Host ''
+if ($copied -gt 0) {
+    Write-Host '============================================'
+    Write-Bi "Copy complete! Vanilla Slot $srcSlot -> Modded Slot $dstSlot ($copied files)" "存档复制完成！原版槽位$srcSlot -> 模组槽位$dstSlot（共 $copied 个文件）" Green
+    Write-Host '============================================'
+    Write-Host ''
+    Write-Bi 'Next time you launch the game with mods, select the corresponding save slot.' '下次启用模组进入游戏时，请选择对应槽位使用复制的进度。' $null
+} else {
+    Write-Bi 'No files were copied.' '没有文件被复制。' Yellow
+}
+
+Write-Host ''
+'@ | Set-Content (Join-Path $zipStageRoot "copy_save_helper.ps1") -Encoding UTF8
+
 Compress-Archive -Path (Join-Path $zipStageRoot "*") -DestinationPath $zipPath -CompressionLevel Optimal
 Remove-Item $zipStageRoot -Recurse -Force