diff --git a/sources/PPU/PPU.cpp b/sources/PPU/PPU.cpp
index a5db727..2cf58d3 100644
--- a/sources/PPU/PPU.cpp
+++ b/sources/PPU/PPU.cpp
@@ -47,26 +47,18 @@ namespace ComSquare::PPU
 		case 0x05: //! @brief $2105 BGMODE (BG Mode and Character Size).
 			this->_bgmode.raw = data;
 			break;
-		case 0x06:
+		case 0x06: //! $2106 MOSAIC (Screen Pixelation)
 			this->_mosaic.raw = data;
 			break;
-		case 0x07:
-			this->_bg1sc.raw = data;
+		case 0x07: // BG1SC (BG1 Tilemap Address and Size)
+		case 0x08: // BG2SC (BG2 Tilemap Address and Size)
+		case 0x09: //! @brief BG3SC (BG3 Tilemap Address and Size)
+		case 0x0A: //! @brief BG4SC (BG4 Tilemap Address and Size)
+			this->_bgsc[addr - 0x07].raw = data;
 			break;
-		case 0x08:
-			this->_bg2sc.raw = data;
-			break;
-		case 0x09:
-			this->_bg3sc.raw = data;
-			break;
-		case 0x0A:
-			this->_bg4sc.raw = data;
-			break;
-		case 0x0B:
-			this->_bg12nba.raw = data;
-			break;
-		case 0x0C:
-			this->_bg34nba.raw = data;
+		case 0x0B: //! @brief BG12NBA (BG1 and 2 Chr Address)
+		case 0x0C: //! @brief BG34NBA (BG3 and 4 Chr Address)
+			this->_bgnba[addr - 0x0B].raw = data;
 			break;
 		//TODO adding the rest of the registers. oaf !
 		default:
diff --git a/sources/PPU/PPU.hpp b/sources/PPU/PPU.hpp
index e0bcfe9..f6db2f5 100644
--- a/sources/PPU/PPU.hpp
+++ b/sources/PPU/PPU.hpp
@@ -129,50 +129,23 @@ namespace ComSquare::PPU
 			};
 			uint8_t raw;
 		} _mosaic;
-		//! @brief BG1SC Register (BG1 Tilemap Address and Size)
+		//! @brief BGSC Registers (BG Tilemap Address and Size)
 		union {
 			struct {
-				uint8_t tilemapAddress: 6;
 				bool tilemapHorizontalMirroring: 1;
 				bool tilemapVerticalMirroring: 1;
-			};
-			uint8_t raw;
-		} _bg1sc;
-		//! @brief BG2SC Register (BG2 Tilemap Address and Size)
-		union {
-			struct {
 				uint8_t tilemapAddress: 6;
-				bool tilemapHorizontalMirroring: 1;
-				bool tilemapVerticalMirroring: 1;
 			};
 			uint8_t raw;
-		} _bg2sc;
-		//! @brief BG3SC Register (BG3 Tilemap Address and Size)
+		} _bgsc[4];
+		//! @brief BGNBA Registers (BG1/2/3/4 Chr Address)
 		union {
 			struct {
-				uint8_t tilemapAddress: 6;
-				bool tilemapHorizontalMirroring: 1;
-				bool tilemapVerticalMirroring: 1;
-			};
-			uint8_t raw;
-		} _bg3sc;
-		//! @brief BG4SC Register (BG4 Tilemap Address and Size)
-		union {
-			struct {
-				uint8_t tilemapAddress: 6;
-				bool tilemapHorizontalMirroring: 1;
-				bool tilemapVerticalMirroring: 1;
-			};
-			uint8_t raw;
-		} _bg4sc;
-		//! @brief BG12NBA Register (BG1 and 2 Chr Address)
-		union {
-			struct {
-				uint8_t baseAddressBg2a4: 4;
 				uint8_t baseAddressBg1a3: 4;
+				uint8_t baseAddressBg2a4: 4;
 			};
 			uint8_t raw;
-		} _bg12nba;
+		} _bgnba[2];
 		//! @brief BG34NBA Register (BG3 and 4 Chr Address)
 		union {
 			struct {
diff --git a/tests/PPU/testPpuWrite.cpp b/tests/PPU/testPpuWrite.cpp
index 1b4170d..27e3b00 100644
--- a/tests/PPU/testPpuWrite.cpp
+++ b/tests/PPU/testPpuWrite.cpp
@@ -155,33 +155,111 @@ Test(PPU_write, bgmode_bgmode_5_and_bg24_on)
 
 Test(PPU_write, mosaic_data_full)
 {
-auto pair = Init();
-pair.first->write(0x2106, 0b11111111);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg1, true);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg2, true);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg3, true);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg4, true);
-cr_assert_eq(pair.second.ppu->_mosaic.pixelSize, 0xF);
+	auto pair = Init();
+	pair.first->write(0x2106, 0b11111111);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg1, true);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg2, true);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg3, true);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg4, true);
+	cr_assert_eq(pair.second.ppu->_mosaic.pixelSize, 0xF);
 }
 
 Test(PPU_write, mosaic_affectbg23_w_1x1_size)
 {
-auto pair = Init();
-pair.first->write(0x2106, 0b00000110);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg1, false);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg2, true);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg3, true);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg4, false);
-cr_assert_eq(pair.second.ppu->_mosaic.pixelSize, 0x0);
+	auto pair = Init();
+	pair.first->write(0x2106, 0b00000110);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg1, false);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg2, true);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg3, true);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg4, false);
+	cr_assert_eq(pair.second.ppu->_mosaic.pixelSize, 0x0);
 }
 
 Test(PPU_write, mosaic_affectbg14_w_2x2_size)
 {
-auto pair = Init();
-pair.first->write(0x2106, 0b00101001);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg1, true);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg2, false);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg3, false);
-cr_assert_eq(pair.second.ppu->_mosaic.affectBg4, true);
-cr_assert_eq(pair.second.ppu->_mosaic.pixelSize, 0x2);
+	auto pair = Init();
+	pair.first->write(0x2106, 0b00101001);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg1, true);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg2, false);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg3, false);
+	cr_assert_eq(pair.second.ppu->_mosaic.affectBg4, true);
+	cr_assert_eq(pair.second.ppu->_mosaic.pixelSize, 0x2);
+}
+
+Test(PPU_write, bg1sc_data_full)
+{
+	auto pair = Init();
+	pair.first->write(0x2107, 0b11111111);
+	cr_assert_eq(pair.second.ppu->_bgsc[0].tilemapAddress, 0b111111);
+	cr_assert_eq(pair.second.ppu->_bgsc[0].tilemapHorizontalMirroring, true);
+	cr_assert_eq(pair.second.ppu->_bgsc[0].tilemapVerticalMirroring, true);
+}
+
+Test(PPU_write, bg2sc_data_full)
+{
+	auto pair = Init();
+	pair.first->write(0x2108, 0b11111111);
+	cr_assert_eq(pair.second.ppu->_bgsc[1].tilemapAddress, 0b111111);
+	cr_assert_eq(pair.second.ppu->_bgsc[1].tilemapHorizontalMirroring, true);
+	cr_assert_eq(pair.second.ppu->_bgsc[1].tilemapVerticalMirroring, true);
+}
+
+Test(PPU_write, bg3sc_data_full)
+{
+	auto pair = Init();
+	pair.first->write(0x2109, 0b11111111);
+	cr_assert_eq(pair.second.ppu->_bgsc[2].tilemapAddress, 0b111111);
+	cr_assert_eq(pair.second.ppu->_bgsc[2].tilemapHorizontalMirroring, true);
+	cr_assert_eq(pair.second.ppu->_bgsc[2].tilemapVerticalMirroring, true);
+}
+
+Test(PPU_write, bg4sc_data_full)
+{
+	auto pair = Init();
+	pair.first->write(0x210A, 0b11111111);
+	cr_assert_eq(pair.second.ppu->_bgsc[3].tilemapAddress, 0b111111);
+	cr_assert_eq(pair.second.ppu->_bgsc[3].tilemapHorizontalMirroring, true);
+	cr_assert_eq(pair.second.ppu->_bgsc[3].tilemapVerticalMirroring, true);
+}
+
+Test(PPU_write, bg4sc_data_null)
+{
+	auto pair = Init();
+	pair.first->write(0x210A, 0b00000000);
+	cr_assert_eq(pair.second.ppu->_bgsc[3].tilemapAddress, 0);
+	cr_assert_eq(pair.second.ppu->_bgsc[3].tilemapHorizontalMirroring, false);
+	cr_assert_eq(pair.second.ppu->_bgsc[3].tilemapVerticalMirroring, false);
+}
+
+Test(PPU_write, bg4sc_horizontal_off_vertical_on_random_tilemapAdress)
+{
+	auto pair = Init();
+	pair.first->write(0x210A, 0b11000110);
+	cr_assert_eq(pair.second.ppu->_bgsc[3].tilemapAddress, 0b110001);
+	cr_assert_eq(pair.second.ppu->_bgsc[3].tilemapHorizontalMirroring, false);
+	cr_assert_eq(pair.second.ppu->_bgsc[3].tilemapVerticalMirroring, true);
+}
+
+Test(PPU_write, bg12nba_data_full)
+{
+	auto pair = Init();
+	pair.first->write(0x210B, 0b11111111);
+	cr_assert_eq(pair.second.ppu->_bgnba[0].baseAddressBg1a3, 0b1111);
+	cr_assert_eq(pair.second.ppu->_bgnba[0].baseAddressBg2a4, 0b1111);
+}
+
+Test(PPU_write, bg34nba_data_full)
+{
+	auto pair = Init();
+	pair.first->write(0x210C, 0b11111111);
+	cr_assert_eq(pair.second.ppu->_bgnba[1].baseAddressBg1a3, 0b1111);
+	cr_assert_eq(pair.second.ppu->_bgnba[1].baseAddressBg2a4, 0b1111);
+}
+
+Test(PPU_write, bg12nba_data_random_data)
+{
+	auto pair = Init();
+	pair.first->write(0x210B, 0b10101010);
+	cr_assert_eq(pair.second.ppu->_bgnba[0].baseAddressBg1a3, 0b1010);
+	cr_assert_eq(pair.second.ppu->_bgnba[0].baseAddressBg2a4, 0b1010);
 }
\ No newline at end of file