diff --git a/src/mame/drivers/konmedal.cpp b/src/mame/drivers/konmedal.cpp
index 9a8dd759a5d..140239167d3 100644
--- a/src/mame/drivers/konmedal.cpp
+++ b/src/mame/drivers/konmedal.cpp
@@ -67,6 +67,7 @@ public:
 	void ddboy(machine_config &config);
 	void tsukande(machine_config &config);
 	void fuusenpn(machine_config &config);
+	void mariorou(machine_config &config);
 
 private:
 	void konmedal_palette(palette_device &palette) const;
@@ -85,12 +86,12 @@ private:
 	uint32_t screen_update_konmedal(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 	uint32_t screen_update_shuriboy(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 	uint32_t screen_update_fuusenpn(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+	uint32_t screen_update_mariorou(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 
 	INTERRUPT_GEN_MEMBER(konmedal_interrupt);
 	K056832_CB_MEMBER(tile_callback);
 
 	K052109_CB_MEMBER(shuriboy_tile_callback);
-	K052109_CB_MEMBER(fuusenpn_tile_callback);
 	TIMER_DEVICE_CALLBACK_MEMBER(scanline);
 	DECLARE_WRITE8_MEMBER(shuri_bank_w);
 	DECLARE_READ8_MEMBER(shuri_irq_r);
@@ -217,6 +218,20 @@ uint32_t konmedal_state::screen_update_fuusenpn(screen_device &screen, bitmap_in
 
 	return 0;
 }
+
+uint32_t konmedal_state::screen_update_mariorou(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+	bitmap.fill(0, cliprect);
+	screen.priority().fill(0, cliprect);
+
+	m_k052109->tilemap_update();
+	m_k052109->tilemap_draw(screen, bitmap, cliprect, 1, 0, 1);
+	m_k052109->tilemap_draw(screen, bitmap, cliprect, 2, 0, 2);
+	m_k052109->tilemap_draw(screen, bitmap, cliprect, 0, 0, 4);
+
+	return 0;
+}
+
 void konmedal_state::konmedal_palette(palette_device &palette) const
 {
 	uint8_t const *const PROM = memregion("proms")->base();
@@ -482,17 +497,32 @@ K052109_CB_MEMBER(konmedal_state::shuriboy_tile_callback)
 	*flags = (*color & 0x1) ? TILE_FLIPX : 0;
 	u8 col = *color;
 	*color = (col >> 4);
-	if (layer > 0) *color |= 8;
-}
-
-K052109_CB_MEMBER(konmedal_state::fuusenpn_tile_callback)
-{
-	*code |= ((*color & 0xc) << 6) | (bank << 10);
-	if (*color & 0x2) *code |= 0x1000;
-	*flags = (*color & 0x1) ? TILE_FLIPX : 0;
-	u8 col = *color;
-	*color = (col >> 4);
-	*color |= 8;
+	if (layer == 0)
+	{
+		if (*color == 1) *color = 0;
+		if (*color == 2) *color = 1;
+		if (*color == 6) *color = 5;
+		if (*color == 8) *color = 4;
+		if (*color == 9) *color = 4;
+		if (*color == 0xa) *color = 5;
+		if (*color == 0xd) *color = 6;
+		if (*color == 0xe) *color = 3;
+	}
+	if (layer == 1)
+	{
+		if (*color == 0) *color = 8;
+		if (*color == 0xa) *color = 0xe;
+		if (*color == 4) *color = 0xa;
+	}
+	if (layer == 2)
+	{
+		if (*color == 6) *color = 3;
+		if (*color == 8) *color = 0xc;
+		if (*color == 0) *color = 8;
+		if (*color == 0xa) *color = 0xd;
+		if (*color == 4) *color = 0xa;
+		if (*color == 5) *color = 0xa;
+	}
 }
 
 WRITE8_MEMBER(konmedal_state::shuri_bank_w)
@@ -583,7 +613,22 @@ void konmedal_state::fuusenpn(machine_config &config)
 	screen.set_screen_update(FUNC(konmedal_state::screen_update_fuusenpn));
 	screen.set_palette(m_palette);
 
-	m_k052109->set_tile_callback(FUNC(konmedal_state::fuusenpn_tile_callback));
+	m_k052109->set_tile_callback(FUNC(konmedal_state::shuriboy_tile_callback));
+}
+
+void konmedal_state::mariorou(machine_config &config)
+{
+	shuriboy(config);
+
+	screen_device &screen(SCREEN(config.replace(), "screen", SCREEN_TYPE_RASTER)); // everything not verified, just a placeholder
+	screen.set_refresh_hz(60);
+	screen.set_vblank_time(ATTOSECONDS_IN_USEC(30));
+	screen.set_size(64*8, 32*8);
+	screen.set_visarea(96, 416-1, 16, 240-1);
+	screen.set_screen_update(FUNC(konmedal_state::screen_update_mariorou));
+	screen.set_palette(m_palette);
+
+	m_k052109->set_tile_callback(FUNC(konmedal_state::shuriboy_tile_callback));
 }
 
 ROM_START( tsukande )
@@ -746,11 +791,13 @@ ROM_START( mariorou )
 	ROM_LOAD( "111_a10.3e.82s129", 0x000300, 0x000100, CRC(07ffc2ed) SHA1(37955d1788a86b90439233bb098c59b191056f68) )
 ROM_END
 
+// K052109 (TMNT tilemaps) board
+GAME( 1991, mariorou, 0,     mariorou, konmedal, konmedal_state, empty_init, ROT0, "Konami", "Mario Roulette", MACHINE_NOT_WORKING)
+GAME( 1993, shuriboy, 0,     shuriboy, konmedal, konmedal_state, empty_init, ROT0, "Konami", "Shuriken Boy", MACHINE_NOT_WORKING)
+GAME( 1993, fuusenpn, 0,     fuusenpn, konmedal, konmedal_state, empty_init, ROT0, "Konami", "Fuusen Pentai", MACHINE_NOT_WORKING)
+
+// K054156/K054157 (GX tilemaps) board
 GAME( 1994, buttobi,  0,     ddboy,    konmedal, konmedal_state, empty_init, ROT0, "Konami", "Buttobi Striker", MACHINE_NOT_WORKING)
 GAME( 1995, tsukande, 0,     tsukande, konmedal, konmedal_state, empty_init, ROT0, "Konami", "Tsukande Toru Chicchi", MACHINE_NOT_WORKING)
 GAME( 1995, ddboy,    0,     ddboy,    konmedal, konmedal_state, empty_init, ROT0, "Konami", "Dam Dam Boy (on dedicated PCB)", MACHINE_NOT_WORKING)
 GAME( 1995, ddboya,   ddboy, ddboy,    konmedal, konmedal_state, empty_init, ROT0, "Konami", "Dam Dam Boy (on Tsukande Toru Chicchi PCB)", MACHINE_NOT_WORKING)
-GAME( 1993, shuriboy, 0,     shuriboy, konmedal, konmedal_state, empty_init, ROT0, "Konami", "Shuriken Boy", MACHINE_NOT_WORKING)
-GAME( 1993, fuusenpn, 0,     fuusenpn, konmedal, konmedal_state, empty_init, ROT0, "Konami", "Fuusen Pentai", MACHINE_NOT_WORKING)
-GAME( 1993, mariorou, 0,     fuusenpn, konmedal, konmedal_state, empty_init, ROT0, "Konami", "Mario Roulette", MACHINE_NOT_WORKING)
-