diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index cf3905e0c5..dbe130f31a 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -294,6 +294,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper203.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper207.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper218.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper222.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper225.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper226.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper227.cs" />
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper222.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper222.cs
new file mode 100644
index 0000000000..82ac877d3a
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper222.cs
@@ -0,0 +1,114 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	// Bad Dudes.7z|Dragon Ninja (J) [p1][!].nes
+	// irq doesn't work right; easily seen in any level but level 1
+	public sealed class Mapper222 : NES.NESBoardBase
+	{
+		int prg_bank_mask_8k;
+		int chr_bank_mask_1k;
+
+		int[] prg = new int[4];
+		int[] chr = new int[8];
+
+		int irq_time = 0;
+		bool irq_counting = false;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER222":
+					break;
+				default:
+					return false;
+			}
+
+			SetMirrorType(EMirrorType.Vertical);
+
+			prg_bank_mask_8k = Cart.prg_size / 8 - 1;
+			chr_bank_mask_1k = Cart.chr_size - 1;
+
+			prg[3] = prg_bank_mask_8k;
+			prg[2] = prg[3] - 1;
+			return true;
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			addr &= 0x7003;
+			switch (addr)
+			{
+				case 0x0000:
+					prg[0] = value & prg_bank_mask_8k;
+					break;
+				case 0x2000:
+					prg[1] = value & prg_bank_mask_8k;
+					break;
+				case 0x7000:
+				case 0x7001:
+					// this is of course sort of VRC like... except it doesn't work right
+					irq_time = (256 - value) * 113;
+					IRQSignal = false;
+					irq_counting = false;
+					Console.WriteLine("IRQ Set\\Ack: SL {0} val {1}", NES.ppu.ppur.status.sl, value);
+					break;
+				case 0x7002:
+					irq_counting = true;
+					Console.WriteLine("IRQ GO: SL {0} val {1}", NES.ppu.ppur.status.sl, value);
+					break;
+			}
+			if (addr >= 0x3000 && addr < 0x7000)	
+			{
+				int b = (addr >> 11) - 6;
+				b |= addr >> 1 & 1;
+
+				if ((addr & 1) != 0)
+					chr[b] = (chr[b] & 0x0f | value << 4) & chr_bank_mask_1k;
+				else
+					chr[b] = (chr[b] & 0xf0 | value & 0x0f) & chr_bank_mask_1k;
+			}
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			return ROM[addr & 0x1fff | prg[addr >> 13] << 13];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+				return VROM[addr & 0x3ff | chr[addr >> 10] << 10];
+			else
+				return base.ReadPPU(addr);
+		}
+
+		public override void ClockCPU()
+		{
+			if (irq_counting)
+			{
+				irq_time--;
+				if (irq_time == 0)
+				{
+					irq_counting = false;
+					IRQSignal = true;
+					Console.WriteLine("IRQ TRIG: SL {0}", NES.ppu.ppur.status.sl);
+				}
+			}
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("prg", ref prg, false);
+			ser.Sync("chr", ref chr, false);
+			ser.Sync("irq_time", ref irq_time);
+			ser.Sync("irq_counting", ref irq_counting);
+			base.SyncState(ser);
+		}
+	}
+}