diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs
index de47032864..e0ae904368 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs
@@ -679,7 +679,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 				// start shifting data into the LCD
 				if (render_counter >= (render_offset + 8))
 				{
-					if (tile_data_latch[2].Bit(5))
+					if (tile_data_latch[2].Bit(5) && Core.GBC_compat)
 					{
 						pixel = tile_data_latch[0].Bit(render_counter % 8) ? 1 : 0;
 						pixel |= tile_data_latch[1].Bit(render_counter % 8) ? 2 : 0;
@@ -692,13 +692,16 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 
 					int ref_pixel = pixel;
 
-					if (LCDC.Bit(0))
+					if (!Core.GBC_compat)
 					{
-						//pixel = (BGP >> (pixel * 2)) & 3;
-					}
-					else
-					{
-						//pixel = 0;
+						if (LCDC.Bit(0))
+						{
+							pixel = (BGP >> (pixel * 2)) & 3;
+						}
+						else
+						{
+							pixel = 0;
+						}
 					}
 
 					int pal_num = tile_data_latch[2] & 0x7;
@@ -739,7 +742,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 								}
 
 								// There is another priority bit in GBC, that can still override sprite priority
-								if (LCDC.Bit(0) && tile_data_latch[2].Bit(7))
+								if (LCDC.Bit(0) && tile_data_latch[2].Bit(7) && Core.GBC_compat)
 								{
 									use_sprite = false;
 								}
@@ -749,28 +752,45 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 							{
 								pal_num = sprite_attr & 7;
 
-								/*
-								if (sprite_attr.Bit(4))
+								if (!Core.GBC_compat)
 								{
-									pixel = (obj_pal_1 >> (s_pixel * 2)) & 3;
-								}
-								else
-								{
-									pixel = (obj_pal_0 >> (s_pixel * 2)) & 3;
-								}	
-								*/						
+									pal_num = sprite_attr.Bit(4) ? 1 : 0;
+
+									if (sprite_attr.Bit(4))
+									{
+										pixel = (obj_pal_1 >> (s_pixel * 2)) & 3;
+									}
+									else
+									{
+										pixel = (obj_pal_0 >> (s_pixel * 2)) & 3;
+									}
+								}						
 							}
 						}
 					}
 
 					// based on sprite priority and pixel values, pick a final pixel color
-					if (use_sprite)
+					if (Core.GBC_compat)
 					{
-						Core._vidbuffer[LY * 160 + pixel_counter] = (int)OBJ_palette[pal_num * 4 + s_pixel];
+						if (use_sprite)
+						{
+							Core._vidbuffer[LY * 160 + pixel_counter] = (int)OBJ_palette[pal_num * 4 + s_pixel];
+						}
+						else
+						{
+							Core._vidbuffer[LY * 160 + pixel_counter] = (int)BG_palette[pal_num * 4 + pixel];
+						}
 					}
 					else
 					{
-						Core._vidbuffer[LY * 160 + pixel_counter] = (int)BG_palette[pal_num * 4 + pixel];
+						if (use_sprite)
+						{
+							Core._vidbuffer[LY * 160 + pixel_counter] = (int)OBJ_palette[pal_num * 4 + pixel];
+						}
+						else
+						{
+							Core._vidbuffer[LY * 160 + pixel_counter] = (int)BG_palette[pixel];
+						}						
 					}
 					
 					pixel_counter++;
@@ -832,7 +852,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 							tile_byte = Core.VRAM[0x1800 + (LCDC.Bit(3) ? 1 : 0) * 0x400 + temp_fetch];						
 							tile_data[2] = Core.VRAM[0x3800 + (LCDC.Bit(3) ? 1 : 0) * 0x400 + temp_fetch];
 							VRAM_sel = tile_data[2].Bit(3) ? 1 : 0;
-							BG_V_flip = tile_data[2].Bit(6);
+							BG_V_flip = tile_data[2].Bit(6) & Core.GBC_compat;
 						}
 						else
 						{
@@ -948,6 +968,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 							tile_byte = Core.VRAM[0x1800 + (LCDC.Bit(6) ? 1 : 0) * 0x400 + temp_fetch];
 							tile_data[2] = Core.VRAM[0x3800 + (LCDC.Bit(6) ? 1 : 0) * 0x400 + temp_fetch];
 							VRAM_sel = tile_data[2].Bit(3) ? 1 : 0;
+							BG_V_flip = tile_data[2].Bit(6) & Core.GBC_compat;
 						}
 						else
 						{
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBHawk.IStatable.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBHawk.IStatable.cs
index d110c68a4c..749164d070 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBHawk.IStatable.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBHawk.IStatable.cs
@@ -87,6 +87,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 			ser.Sync("RAM_Bank", ref RAM_Bank);
 			ser.Sync("VRAM_Bank", ref VRAM_Bank);
 			ser.Sync("is_GBC", ref is_GBC);
+			ser.Sync("GBC_compat", ref GBC_compat);
 			ser.Sync("double_speed", ref double_speed);
 			ser.Sync("speed_switch", ref speed_switch);
 			ser.Sync("HDMA_transfer", ref HDMA_transfer);
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBHawk.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBHawk.cs
index 7c7ae38b9b..3b48926029 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBHawk.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBHawk.cs
@@ -54,6 +54,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 		public int RAM_Bank;
 		public byte VRAM_Bank;
 		public bool is_GBC;
+		public bool GBC_compat; // compatibility mode for GB games played on GBC
 		public bool double_speed;
 		public bool speed_switch;
 		public bool HDMA_transfer; // stalls CPU when in progress
@@ -276,6 +277,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 		private void HardReset()
 		{
 			GB_bios_register = 0; // bios enable
+			GBC_compat = true;
 			in_vblank = true; // we start off in vblank since the LCD is off
 			in_vblank_old = true;
 
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/HW_Registers.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/HW_Registers.cs
index 396fc7ec32..84389700b9 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/HW_Registers.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/HW_Registers.cs
@@ -309,6 +309,14 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 					ppu.WriteReg(addr, value);
 					break;
 
+				// GBC compatibility register (I think)
+				case 0xFF4C:
+					if (value != 0xC0)
+					{
+						GBC_compat = false;
+					}
+					break;
+
 				// Speed Control for GBC
 				case 0xFF4D:
 					if (is_GBC)
@@ -382,6 +390,12 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
 					if (((REG_FF0F & 0x1F) & REG_FFFF) == 0) { cpu.FlagI = false; }
 
 					break;
+
+				default:
+					Console.Write(addr);
+					Console.Write(" ");
+					Console.WriteLine(value);
+					break;
 			}
 		}