diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index 7d1049f76e..b9bb5cffe2 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -641,6 +641,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-190in1.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-A65AS.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-GS-2004.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-GS-2013.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-T-262.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UxROM.cs">
       <SubType>Code</SubType>
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-GS-2004.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-GS-2004.cs
index 7d8d814c02..fa420c059c 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-GS-2004.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-GS-2004.cs
@@ -2,12 +2,13 @@
 
 namespace BizHawk.Emulation.Cores.Nintendo.NES
 {
+	// Tetris Fily 6-in-1 (GS-2004) (U) [!]
 	public class UNIF_BMC_GS_2004 : NES.NESBoardBase
 	{
 		private int _reg = 0xFF;
 
 		private int _prgMask32k;
-		private int _wramPage;
+		private int _wramOffset;
 
 		public override bool Configure(NES.EDetectionOrigin origin)
 		{
@@ -23,7 +24,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			_prgMask32k = (Cart.prg_size - 8) / 32 - 1;
 
 			// Last 8k of Prg goes into 6000-7FFF 
-			_wramPage = ((Cart.prg_size - 8) / 32) * 0x8000;
+			_wramOffset = ((Cart.prg_size - 8) / 32) * 0x8000;
 
 			SetMirrorType(EMirrorType.Vertical);
 
@@ -50,7 +51,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 
 		public override byte ReadWRAM(int addr)
 		{
-			return ROM[_wramPage + (addr & 0x1FFF)];
+			return ROM[_wramOffset + (addr & 0x1FFF)];
 		}
 
 		public override byte ReadPRG(int addr)
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-GS-2013.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-GS-2013.cs
new file mode 100644
index 0000000000..e39ad1cbab
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-GS-2013.cs
@@ -0,0 +1,67 @@
+using BizHawk.Common;
+using BizHawk.Common.NumberExtensions;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	// Tetris Family 12-in-1 (GS-2013) [U][!]
+	// This cart is 2 ROMs in 1
+	// Pretty much the UNIF_BMC-GS_2004 board, with more Rom tacked on
+	public class UNIF_BMC_GS_2013 : NES.NESBoardBase
+	{
+		private int _reg = 0xFF;
+		private bool _isRom2 = true;
+
+		private int _prgMaskRom1 = 7;
+		private int _prgMaskRom2 = 1;
+
+		private int _wramPage = 0x3E000;
+		private int _rom2Offset = 0x40000;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "UNIF_BMC-GS-2013":
+					break;
+				default:
+					return false;
+			}
+
+			SetMirrorType(EMirrorType.Vertical);
+
+			return true;
+		}
+
+		public override void NESSoftReset()
+		{
+			_reg = 0xFF;
+			_isRom2 = true;
+			base.NESSoftReset();
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("reg", ref _reg);
+			ser.Sync("_isRom2", ref _isRom2);
+
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			_isRom2 = value.Bit(3);
+			_reg = value;
+		}
+
+		public override byte ReadWRAM(int addr)
+		{
+			return ROM[_wramPage + (addr & 0x1FFF)];
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			int bank = _reg & (_isRom2 ? _prgMaskRom2 : _prgMaskRom1);
+			return ROM[(bank * 0x8000) + (addr & 0x7FFF) + (_isRom2 ? _rom2Offset : 0)];
+		}
+	}
+}