diff --git a/Core/Memory/SmsMemoryBus.cs b/Core/Memory/SmsMemoryBus.cs
index 9ab9cb4..d5d54e2 100644
--- a/Core/Memory/SmsMemoryBus.cs
+++ b/Core/Memory/SmsMemoryBus.cs
@@ -6,6 +6,7 @@ namespace Core.Memory
 {
     public class SmsMemoryBus : IMemory
     {
+        private bool _isCodemastersMapper = false; //Codemasters used their own memory mapper
         // SMS has 8KB of internal Work RAM
         private readonly byte[] _workRam = new byte[0x2000];
 
@@ -49,6 +50,10 @@ namespace Core.Memory
 
             if (address < 0x4000)
             {
+                if (!_isCodemastersMapper && address < 0x0400)
+                {
+                    return _cartridgeRom[address];
+                }
                 if (address < 0x0400)
                 {
                     return _cartridgeRom[address];
@@ -76,6 +81,18 @@ namespace Core.Memory
 
         public void Write(ushort address, byte value)
         {
+            // Codemasters games bank-switch by writing directly to ROM!
+            if (address == 0x0000 || address == 0x4000 || address == 0x8000)
+            {
+                _isCodemastersMapper = true;
+                int cTotalBanks = _cartridgeRom.Length / 0x4000;
+                if (cTotalBanks == 0) cTotalBanks = 1;
+
+                if (address == 0x0000) _romBank0 = value % cTotalBanks;
+                else if (address == 0x4000) _romBank1 = value % cTotalBanks;
+                else if (address == 0x8000) _romBank2 = value % cTotalBanks;
+                return;
+            }
             if (address < 0x8000) return; // Cannot write to physical ROM
 
             if (address < 0xC000)
@@ -266,6 +283,7 @@ namespace Core.Memory
         {
             Array.Clear(_workRam, 0, _workRam.Length);
             _mapperControl = 0;
+            _isCodemastersMapper = false;
         }
     }
 }
\ No newline at end of file
diff --git a/Desktop/Desktop.csproj b/Desktop/Desktop.csproj
index 854299c..7fbf857 100644
--- a/Desktop/Desktop.csproj
+++ b/Desktop/Desktop.csproj
@@ -27,6 +27,7 @@
 
 	<ItemGroup>
 		<None Remove="ROMS\After Burner %28UE%29 [!].sms" />
+		<None Remove="ROMS\Aladdin %28USA, Europe, Brazil%29.gg" />
 		<None Remove="ROMS\Alex Kidd in High Tech World %28UE%29 [!].sms" />
 		<None Remove="ROMS\Alex Kidd in Miracle World %28UE%29 [!].sms" />
 		<None Remove="ROMS\Back to the Future 2 %28UE%29 [!].sms" />
@@ -94,6 +95,8 @@
 		<None Remove="ROMS\Sonic 1 GG.gg" />
 		<None Remove="ROMS\Sonic 2.sms" />
 		<None Remove="ROMS\Sonic Chaos %28UE%29 [!].sms" />
+		<None Remove="ROMS\Sonic The Hedgehog - Triple Trouble %28USA, Europe, Brazil%29.gg" />
+		<None Remove="ROMS\Sonic The Hedgehog 2 %28World%29.gg" />
 		<None Remove="ROMS\Sonic.sms" />
 		<None Remove="ROMS\Space Harrier %28USA%29.sms" />
 		<None Remove="ROMS\Speedball %28UE%29 %28Virgin%29 [!].sms" />
@@ -126,6 +129,7 @@
 		<EmbeddedResource Include="ROMS\After Burner (UE) [!].sms">
 			<CopyToOutputDirectory>Never</CopyToOutputDirectory>
 		</EmbeddedResource>
+		<EmbeddedResource Include="ROMS\Aladdin (USA, Europe, Brazil).gg" />
 		<EmbeddedResource Include="ROMS\Alex Kidd in High Tech World (UE) [!].sms">
 			<CopyToOutputDirectory>Never</CopyToOutputDirectory>
 		</EmbeddedResource>
@@ -309,6 +313,8 @@
 		<EmbeddedResource Include="ROMS\Sonic Chaos (UE) [!].sms">
 			<CopyToOutputDirectory>Never</CopyToOutputDirectory>
 		</EmbeddedResource>
+		<EmbeddedResource Include="ROMS\Sonic The Hedgehog - Triple Trouble (USA, Europe, Brazil).gg" />
+		<EmbeddedResource Include="ROMS\Sonic The Hedgehog 2 (World).gg" />
 		<EmbeddedResource Include="ROMS\Sonic.sms">
 			<CopyToOutputDirectory>Never</CopyToOutputDirectory>
 		</EmbeddedResource>
diff --git a/Desktop/ROMS/Aladdin (USA, Europe, Brazil).gg b/Desktop/ROMS/Aladdin (USA, Europe, Brazil).gg
new file mode 100644
index 0000000..46301a8
Binary files /dev/null and b/Desktop/ROMS/Aladdin (USA, Europe, Brazil).gg differ
diff --git a/Desktop/ROMS/Sonic The Hedgehog - Triple Trouble (USA, Europe, Brazil).gg b/Desktop/ROMS/Sonic The Hedgehog - Triple Trouble (USA, Europe, Brazil).gg
new file mode 100644
index 0000000..d7ee99d
Binary files /dev/null and b/Desktop/ROMS/Sonic The Hedgehog - Triple Trouble (USA, Europe, Brazil).gg differ
diff --git a/Desktop/ROMS/Sonic The Hedgehog 2 (World).gg b/Desktop/ROMS/Sonic The Hedgehog 2 (World).gg
new file mode 100644
index 0000000..6b60690
Binary files /dev/null and b/Desktop/ROMS/Sonic The Hedgehog 2 (World).gg differ