diff --git a/Assets/dll/gpgx.wbx.zst b/Assets/dll/gpgx.wbx.zst
index fab2d65aa8..676b5dd046 100644
Binary files a/Assets/dll/gpgx.wbx.zst and b/Assets/dll/gpgx.wbx.zst differ
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.ISettable.cs b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.ISettable.cs
index 02f59d175a..9616c11485 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.ISettable.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.ISettable.cs
@@ -268,6 +268,16 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 			[DefaultValue(false)]
 			public bool LoadBIOS { get; set; }
 
+			[DisplayName("Overscan")]
+			[Description("Sets overscan borders shown.")]
+			[DefaultValue(LibGPGX.InitSettings.OverscanType.None)]
+			public LibGPGX.InitSettings.OverscanType Overscan { get; set; }
+
+			[DisplayName("[GG] Display Extra Area")]
+			[Description("Enables displaying extended Game Gear screen (256x192).")]
+			[DefaultValue(false)]
+			public bool GGExtra { get; set; }
+
 			[DisplayName("[SMS] FM Sound Chip Type")]
 			[Description("Sets the method used to emulate the FM Sound Unit of the Sega Mark III/Master System. 'MAME' is fast and runs full speed on most systems.'Nuked' is cycle accurate, very high quality, and have substantial CPU requirements.")]
 			[DefaultValue(LibGPGX.InitSettings.SMSFMSoundChipType.YM2413_MAME)]
@@ -343,7 +353,9 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 					ForceSram = game["sram"],
 					SMSFMSoundChip = SMSFMSoundChip,
 					GenesisFMSoundChip = GenesisFMSoundChip,
-					SpritesAlwaysOnTop = SpritesAlwaysOnTop
+					SpritesAlwaysOnTop = SpritesAlwaysOnTop,
+					Overscan = Overscan,
+					GGExtra = GGExtra,
 				};
 			}
 
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs
index 8aad1e6985..7b6e87cd86 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/LibGPGX.cs
@@ -74,6 +74,16 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 
 			public bool SpritesAlwaysOnTop;
 			public bool LoadBIOS;
+
+			public enum OverscanType : byte
+			{
+				None,
+				Vertical,
+				Horizontal,
+				All
+			}
+			public OverscanType Overscan;
+			public bool GGExtra;
 		}
 
 		[BizImport(CallingConvention.Cdecl)]
diff --git a/waterbox/gpgx/cinterface/cinterface.c b/waterbox/gpgx/cinterface/cinterface.c
index 3dbf03a301..a5b4460df5 100644
--- a/waterbox/gpgx/cinterface/cinterface.c
+++ b/waterbox/gpgx/cinterface/cinterface.c
@@ -607,7 +607,7 @@ enum GenesisFMSoundChipType
 struct InitSettings
 {
 	uint32_t BackdropColor;
-	int Region;
+	int32_t Region;
 	uint16_t LowPassRange;
 	int16_t LowFreq;
 	int16_t HighFreq;
@@ -615,14 +615,16 @@ struct InitSettings
 	int16_t MidGain;
 	int16_t HighGain;
 	uint8_t Filter;
-	char InputSystemA;
-	char InputSystemB;
-	char SixButton;
-	char ForceSram;
+	uint8_t InputSystemA;
+	uint8_t InputSystemB;
+	uint8_t SixButton;
+	uint8_t ForceSram;
 	uint8_t SMSFMSoundChip;
 	uint8_t GenesisFMSoundChip;
 	uint8_t SpritesAlwaysOnTop;
 	uint8_t LoadBios;
+	uint8_t Overscan;
+	uint8_t GGExtra;
 };
 
 
@@ -759,7 +761,7 @@ GPGX_EX int gpgx_init(const char* feromextension,
 
 	// Selecting FM Sound chip to use for SMS / GG emulation. Using a default for now, until we also
 	// accept this core for SMS/GG emulation in BizHawk
- switch (settings->SMSFMSoundChip)
+	switch (settings->SMSFMSoundChip)
 	{
 		case YM2413_DISABLED:
 			config.opll = 0;
@@ -819,8 +821,8 @@ GPGX_EX int gpgx_init(const char* feromextension,
 	config.cd_latency     = 1;
 
 	/* display options */
-	config.overscan               = 0;  /* 3 = all borders (0 = no borders , 1 = vertical borders only, 2 = horizontal borders only) */
-	config.gg_extra               = 0;  /* 1 = show extended Game Gear screen (256x192) */
+	config.overscan               = settings->Overscan; /* 3 = all borders (0 = no borders , 1 = vertical borders only, 2 = horizontal borders only) */
+	config.gg_extra               = settings->GGExtra; /* 1 = show extended Game Gear screen (256x192) */
 	config.render                 = 1;  /* 1 = double resolution output (only when interlaced mode 2 is enabled) */
 	config.ntsc                   = 0;
 	config.lcd                    = 0;  /* 0.8 fixed point */