diff --git a/Core/MMC3_BmcL6in1.h b/Core/MMC3_BmcL6in1.h
new file mode 100644
index 00000000..ad5ee36f
--- /dev/null
+++ b/Core/MMC3_BmcL6in1.h
@@ -0,0 +1,62 @@
+#pragma once
+#include "stdafx.h"
+#include "MMC3.h"
+
+class MMC3_BmcL6in1 : public MMC3
+{
+private:
+	uint8_t _exReg;
+
+protected:
+	void InitMapper() override
+	{
+		AddRegisterRange(0x6000, 0x7FFF, MemoryOperation::Write);
+		_exReg = 0;
+
+		MMC3::InitMapper();
+	}
+
+	void Reset(bool softreset) override
+	{
+		_exReg = 0;
+		UpdateState();
+	}
+
+	void StreamState(bool saving) override
+	{
+		MMC3::StreamState(saving);
+		Stream(_exReg);
+	}
+
+	void UpdateMirroring() override
+	{
+		if(_exReg & 0x20) {
+			SetMirroringType((_exReg & 0x10) ? MirroringType::ScreenBOnly : MirroringType::ScreenAOnly);
+		} else {
+			MMC3::UpdateMirroring();
+		}
+	}
+
+	void SelectPRGPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType = PrgMemoryType::PrgRom) override
+	{
+		if(_exReg & 0x0C) {
+			MMC3::SelectPRGPage(slot, (page & 0x0F) | (_exReg & 0xC0) >> 2);
+		} else {
+			uint8_t bank = ((_exReg & 0xC0) >> 4) | (_exReg & 0x03);
+			SelectPrgPage4x(0, bank << 2);
+		}
+	}
+
+	void WriteRegister(uint16_t addr, uint8_t value) override
+	{
+		if(addr < 0x8000) {
+			if(CanWriteToWorkRam()) {
+				_exReg = value;
+				UpdatePrgMapping();
+				UpdateMirroring();
+			}
+		} else {
+			MMC3::WriteRegister(addr, value);
+		}
+	}
+};
\ No newline at end of file
diff --git a/Core/MapperFactory.cpp b/Core/MapperFactory.cpp
index ff0ca23c..0455232a 100644
--- a/Core/MapperFactory.cpp
+++ b/Core/MapperFactory.cpp
@@ -193,6 +193,7 @@
 #include "MMC3_BmcGn26.h"
 #include "MMC3_BmcK3006.h"
 #include "MMC3_BmcK3033.h"
+#include "MMC3_BmcL6in1.h"
 #include "MMC3_ChrRam.h"
 #include "MMC3_Coolboy.h"
 #include "MMC3_Kof97.h"
@@ -622,7 +623,7 @@ BaseMapper* MapperFactory::GetMapperFromID(RomData &romData)
 		case 342: break; //COOLGIRL
 		//343
 		case 344: return new MMC3_BmcGn26();
-		case 345: break; //L6IN1
+		case 345: return new MMC3_BmcL6in1();
 		case 346: return new Kaiser7012();
 		//347
 		case 348: return new Bmc830118C();
diff --git a/Core/UnifLoader.cpp b/Core/UnifLoader.cpp
index f0552842..b749395d 100644
--- a/Core/UnifLoader.cpp
+++ b/Core/UnifLoader.cpp
@@ -180,4 +180,5 @@ std::unordered_map<string, int> UnifLoader::_boardMappings = std::unordered_map<
 	{ "K-3006", 339 },
 	{ "K-3033", 322 },
 	{ "K-3036", 340 },
+	{ "L6IN1", 345 },
 };