diff --git a/Assets/gamedb/gamedb_intv.txt b/Assets/gamedb/gamedb_intv.txt
index 0ff1d4a292..d425c862c1 100644
--- a/Assets/gamedb/gamedb_intv.txt
+++ b/Assets/gamedb/gamedb_intv.txt
@@ -2,6 +2,7 @@
 
 sha1:094B207668C03A6D903270490F495DDC237CD8D7		Atlantis	INTV		board=7
 sha1:1B6FD19E745E50E8EA679BD5ADFB719D1F276BC5		Beauty and the Beast (1982) (Imagic) [!]	INTV		board=7
+sha1:397B1A6036A6E7A63FA9182ED9B07F6A3DEA85B7		Blowout	INTV		board=11
 sha1:49B474D0317CC0E6C83CE77BA46D5DED2EC56005		Body Slam - Super Pro Wrestling (1988) (Intv Corp)	INTV		board=2
 sha1:97C69DC3DA5AEE80E6EF1BAF90B6C3EC8025ABFF		Centipede (1983) (Atarisoft)	INTV		board=6
 sha1:A402BCC8D1E50FEBC01AC2D91237742192AFF7C7		Championship Tennis (1985) (Mattel)	INTV		board=1
@@ -13,6 +14,7 @@ sha1:85AF8649C04198B00CECDEA2661192DB6631DC80		Defender (1983) (Atarisoft)	INTV
 sha1:D6054E8EAD16F3E076C26880FE641543E8519E18		Demon Attack (1982) (Imagic) [!]	INTV		board=7
 sha1:6E281043C7BB37B20CFC48CFEFB5F28922B3A3CE		Dig Dug (1987) (Intv Corp)	INTV		board=5
 sha1:B55D83D2F5B2BF408EA696D6B7D56E71782C3507		Diner (1987) (Intv Corp)	INTV		board=2
+sha1:F91D4507BAF41626D839308659E68DE048C767C8		Flappy Bird	INTV		board=0
 sha1:EE4018D4384121B9E29A37C4583BFBCC55E6ED4E		Game Factory (Prototype) (1983) (Mattel) [!]	INTV		board=9
 sha1:2D96762D78A63F606B74C6619F3B2B82C381FCCE		Hover Force (1986) (Intv Corp)	INTV		board=2
 sha1:3EF8ACBC764F7916337A07407222C0BCE092A058		King of the Mountain (1982) (Mattel)	INTV		board=1
@@ -20,11 +22,13 @@ sha1:97073F31A8C9B5B04E773FCB145C4235A4712FF7		Land Battle (1982) (Mattel)	INTV
 sha1:6EEAEB4CA39D30B6255814CD9F92CF8D092C393D		Learning Fun I - Math Master Factor Fun (1987) (Intv Corp)	INTV		board=2
 sha1:134AF61BC7B06489D35A7474F8A29EF80DB6F332		Learning Fun II - Word Wizard Memory Fun (1987) (Intv Corp)	INTV		board=2
 sha1:1390F0076470504037720B20F84404D502988231		Microsurgeon (1982) (Imagic) [!]	INTV		board=7
-sha1:21F6AABE3462594EA5E20EEED7AEF493BE427911		Ms PcaMan	INTV		board=10
+sha1:C4ABF77C2CFC0E7B590E2260C56360F9738C45D6		Minehunter	INTV		board=0
+sha1:2DB40CF210534E563D5ECA5C923C1F937AFE6994		Ms PcaMan	INTV		board=10
 sha1:BAF51811E8238AD56F74879E839A8AF6B5612962		MTE201 Intellivision Test Cartridge (1978) (Mattel)	INTV		board=8
 sha1:66DDC9C56EDEE06564C1252C7C6BC3123DA8C31D		Pac-Man (1983) (Atarisoft)	INTV		board=5
 sha1:48023975E4BA875B745B5B9AAC0FB562922B50C3		Pac-Man (1983) (Intv Corp)	INTV		board=5
 sha1:7A606D908D6D25B1F6033DBACC997EA813576D94		Pole Position (1986) (Intv Corp)	INTV		board=2
+sha1:ECC12AAAC0019D43924562862EAF3661FA40EC02		Scarfinger	INTV		board=2
 sha1:BA455F1DF7A4BADDDB129C724F2E9ACA46D6F636		Slam Dunk - Super Pro Basketball (1987) (Intv Corp)	INTV		board=2
 sha1:CBC9B04ED52034283CD307ED5D3B2843E70F0409		Spiker! - Super Pro Volleyball (1988) (Intv Corp)	INTV		board=2
 sha1:8547B9CF117ED1A1CAF0953A8B545587206DC4F7		Stadium Mud Buggies (1988) (Intv Corp)	INTV		board=2
@@ -33,4 +37,4 @@ sha1:08C97D4E23B8033D9437241C1F4D8A1486D1E9EA		Super Pro Football (1986) (Intv C
 sha1:DE35812076BDA03999A55B2969A67299CCFB83C4		Tower of Doom (1986) (Intv Corp)	INTV		board=3
 sha1:EA784E2921DD3A7CAF85C029DE7D937C80D50C58		Triple Challenge (1986) (Intv Corp)	INTV		board=9
 sha1:4CCF494F9664D5B9E05237D1BC2EEE8A7830F067		USCF Chess (1981) (Mattel)	INTV		board=4
-sha1:8AEF03392F53BC947E4F521A29F31A3C32D01104		World Series Major League Baseball (1983) (Mattel) [!]	INTV		board=1
+sha1:8AEF03392F53BC947E4F521A29F31A3C32D01104		World Series Major League Baseball (1983) (Mattel) [!]	INTV		board=1
\ No newline at end of file
diff --git a/src/BizHawk.Client.Common/RomGame.cs b/src/BizHawk.Client.Common/RomGame.cs
index f9f4b02d6e..e00093f7ce 100644
--- a/src/BizHawk.Client.Common/RomGame.cs
+++ b/src/BizHawk.Client.Common/RomGame.cs
@@ -14,6 +14,10 @@ namespace BizHawk.Client.Common
 		public GameInfo GameInfo { get; }
 		public string Extension { get; }
 
+		// false positives of the header check (512 bytes in intv games)
+		public const string Flappy_Bird_INTV = "SHA1:C4ABF77C2CFC0E7B590E2260C56360F9738C45D6";
+		public const string Minehunter_INTV = "SHA1:F91D4507BAF41626D839308659E68DE048C767C8";
+
 		private const int BankSize = 1024;
 
 		public RomGame(HawkFile file)
@@ -56,6 +60,8 @@ namespace BizHawk.Client.Common
 			stream.Position = 0;
 			stream.Read(FileData, 0, fileLength);
 
+			string SHA1_check = SHA1Checksum.ComputePrefixedHex(FileData);
+
 			// if there was no header offset, RomData is equivalent to FileData
 			// (except in cases where the original interleaved file data is necessary.. in that case we'll have problems..
 			// but this whole architecture is not going to withstand every peculiarity and be fast as well.
@@ -71,6 +77,12 @@ namespace BizHawk.Client.Common
 				// (-Asnivor)
 				RomData = FileData;
 			}
+			else if (SHA1_check == Flappy_Bird_INTV || SHA1_check == Minehunter_INTV)
+			{
+				// several INTV games have sizes that are multiples of 512 bytes
+				Console.WriteLine("False positive detected in Header Check, using entire file.");
+				RomData = FileData;
+			}
 			else
 			{
 				// if there was a header offset, read the whole file into FileData and then copy it into RomData (this is unfortunate, in case RomData isn't needed)
@@ -104,7 +116,7 @@ namespace BizHawk.Client.Common
 				// for now only .A78 games, but probably should be for other systems as well
 				RomData = FileData;
 			}
-			
+
 			CheckForPatchOptions();
 
 			if (patch != null)
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Intellivision/Cartridge.cs b/src/BizHawk.Emulation.Cores/Consoles/Intellivision/Cartridge.cs
index 811c837891..8a31f9fee2 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Intellivision/Cartridge.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Intellivision/Cartridge.cs
@@ -11,7 +11,7 @@ namespace BizHawk.Emulation.Cores.Intellivision
 
 		private ushort[] Cart_Ram = new ushort[0x800];
 
-		// There are 10 mappers Intellivision games use (not counting intellicart which is handled seperately)
+		// There are several mappers Intellivision games use (not counting intellicart which is handled seperately)
 		// we will pick the mapper from the game DB and default to 0
 		private int _mapper = 0;
 
@@ -213,6 +213,17 @@ namespace BizHawk.Emulation.Cores.Intellivision
 						return Data[addr - 0x8000];
 					}
 					break;
+				case 11:
+					if (addr >= 0x5000 && addr <= 0x5FFF)
+					{
+						return Data[addr - 0x5000];
+					}
+
+					if (addr >= 0xD000 && addr <= 0xDFFF)
+					{
+						return Data[addr - 0xC000];
+					}
+					break;
 			}
 
 			return null;