diff --git a/Legacy/Mermaid/ImageMG1.cs b/Legacy/Mermaid/ImageMG1.cs
new file mode 100644
index 00000000..beb9b3fe
--- /dev/null
+++ b/Legacy/Mermaid/ImageMG1.cs
@@ -0,0 +1,114 @@
+//! \file       ImageMG1.cs
+//! \date       2018 Mar 19
+//! \brief      Mermaid obfuscated bitmap.
+//
+// Copyright (C) 2018 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+
+namespace GameRes.Formats.Mermaid
+{
+    internal class MgMetaData : ImageMetaData
+    {
+        public uint ImageOffset;
+        public int  TileCount;
+    }
+
+#if DEBUG
+    [Export(typeof(ImageFormat))]
+#endif
+    public class MgFormat : ImageFormat
+    {
+        public override string         Tag { get { return "MG1"; } }
+        public override string Description { get { return "Mermaid obfuscated bitmap"; } }
+        public override uint     Signature { get { return 0; } }
+
+        public MgFormat ()
+        {
+            Extensions = new string[] { "mg1", "mg2" };
+        }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            if (!file.Name.HasAnyOfExtensions ("mg1", "mg2"))
+                return null;
+            var header = file.ReadHeader (0x36);
+            if (!header.AsciiEqual ("BM"))
+                return null;
+            int width = header.ToInt32 (0x12);
+            int tile_count = 5;
+            if (file.Name.HasExtension ("mg2"))
+                tile_count = width / 32;
+            return new MgMetaData {
+                Width = (uint)width,
+                Height = header.ToUInt32 (0x16),
+                BPP = header.ToInt16 (0x1C),
+                ImageOffset = header.ToUInt32 (0x0A),
+                TileCount = tile_count,
+            };
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            var meta = (MgMetaData)info;
+            PixelFormat format;
+            if (24 == meta.BPP)
+                format = PixelFormats.Bgr24;
+            else if (32 == meta.BPP)
+                format = PixelFormats.Bgr32;
+            else
+                throw new InvalidFormatException();
+
+            int tile_count = meta.TileCount;
+            int stride = (int)meta.Width * ((meta.BPP + 7) / 8);
+            int height = (int)meta.Height;
+            int tile_width = stride / tile_count;
+            int tile_height = (height + tile_count - 1) / tile_count;
+            var pixels = new byte[stride * height];
+            int row_size = tile_height * stride;
+            file.Position = meta.ImageOffset;
+            for (int dst = row_size - stride; dst >= 0; dst -= stride)
+            {
+                for (int y = tile_count-1; y >= 0; --y)
+                {
+                    int tile_dst = dst + y * tile_width;
+                    for (int x = 0; x < tile_count; ++x)
+                    {
+                        if (tile_dst + tile_width > pixels.Length)
+                            file.Seek (tile_width, SeekOrigin.Current);
+                        else
+                            file.Read (pixels, tile_dst, tile_width);
+                        tile_dst += row_size;
+                    }
+                }
+            }
+            return ImageData.Create (info, format, null, pixels, stride);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("MgFormat.Write not implemented");
+        }
+    }
+}