diff --git a/sources/PPU/Background.cpp b/sources/PPU/Background.cpp
index 164be82..52658c0 100644
--- a/sources/PPU/Background.cpp
+++ b/sources/PPU/Background.cpp
@@ -54,9 +54,8 @@ namespace ComSquare::PPU
 		uint8_t reference = 0;
 		uint32_t color = 0;
 
-		//union isn't working as intended
 		tileData.raw = data;
-		palette = getPalettes(tileData.palette);
+		palette = getPalette(tileData.palette);
 		// X horizontal
 		// Y vertical
 		graphicAddress = this->_tilesetAddress + (tileData.posY * 16 * this->_bpp * 8) + (tileData.posX * this->_bpp * 8);
@@ -74,12 +73,12 @@ namespace ComSquare::PPU
 		}
 	}
 
-	std::vector<uint16_t> Background::getPalettes(int nbPalette)
+	std::vector<uint16_t> Background::getPalette(int nbPalette)
 	{
-		std::vector<uint16_t> palette(0xF);
-		uint16_t addr = nbPalette * 0x10;
+		std::vector<uint16_t> palette(0x10);
+		uint16_t addr = nbPalette * 0x20;
 
-		for (int i = 0; i < 0xF; i++) {
+		for (int i = 0; i < 0x10; i++) {
 			palette[i] = this->_cgram->read_internal(addr);
 			palette[i] += this->_cgram->read_internal(addr + 1) << 8U;
 			addr += 2;
@@ -119,8 +118,8 @@ namespace ComSquare::PPU
 		case 8:
 			return highByte;
 		case 4:
-			secondHighByte =  this->_vram->read_internal((tileAddress + 32) % VRAMSIZE);
-			secondLowByte = this->_vram->read_internal((tileAddress + 33) % VRAMSIZE);
+			secondHighByte =  this->_vram->read_internal((tileAddress + 16) % VRAMSIZE);
+			secondLowByte = this->_vram->read_internal((tileAddress + 17) % VRAMSIZE);
 			result = ((secondHighByte & (1U << shift)) | ((secondLowByte & (1U << shift)) << 1U)) >> (shift - 2U);
 		case 2:
 			result += ((highByte & (1U << shift)) | ((lowByte & (1U << shift)) << 1U)) >> shift;
@@ -165,4 +164,12 @@ namespace ComSquare::PPU
 	{
 		this->_characterSize = size;
 	}
+
+	void Background::setBpp(int bpp)
+	{
+		if (bpp == 2 || bpp == 4 || bpp == 8 || bpp == 7)
+			this->_bpp = bpp;
+		else
+			this->_bpp = 2;
+	}
 }
\ No newline at end of file
diff --git a/sources/PPU/Background.hpp b/sources/PPU/Background.hpp
index 230d643..45f006f 100644
--- a/sources/PPU/Background.hpp
+++ b/sources/PPU/Background.hpp
@@ -39,7 +39,7 @@ namespace ComSquare::PPU
 		//! @brief Get a palette from the number of the palette
 		//! @param nbPalette The palette number (0 - 7)
 		//! @return The array of color of the palette
-		std::vector<uint16_t> getPalettes(int nbPalette);
+		std::vector<uint16_t> getPalette(int nbPalette);
 		//! @brief Get the color reference of a pixel from the address of the row
 		//! @param tileAddress The address of the line of pixel
 		//! @param pixelIndex The index of the pixel (0 - 7)
@@ -71,6 +71,9 @@ namespace ComSquare::PPU
 		void setCharacterSize(Vector2<int> size);
 		//! @brief Set the tileset address of the background
 		void setTilesetAddress(uint16_t address);
+		//! @brief Set the bpp (bits per pixels) of the Background
+		//! @info The bpp can be 2, 4 or 8 (7 can be possible when BgMode is 7)
+		void setBpp(int bpp);
 	};
 }
 
diff --git a/sources/PPU/PPU.cpp b/sources/PPU/PPU.cpp
index 8dcfe71..e84c468 100644
--- a/sources/PPU/PPU.cpp
+++ b/sources/PPU/PPU.cpp
@@ -115,6 +115,12 @@ namespace ComSquare::PPU
 		//registers
 
 		this->_registers._bgmode.bgMode = 1;
+		this->_backgrounds[0].setBpp(this->getBPP(1));
+		this->_backgrounds[1].setBpp(this->getBPP(1));
+		this->_backgrounds[2].setBpp(this->getBPP(2));
+		this->_backgrounds[3].setBpp(this->getBPP(2));
+		this->_backgrounds[4].setBpp(this->getBPP(3));
+		this->_backgrounds[5].setBpp(this->getBPP(3));
 		//this->_registers._bgmode.characterSizeBg1 = false;
 		//this->_registers._bgmode.characterSizeBg2 = false;
 		this->_registers._bgmode.mode1Bg3PriorityBit = true;
@@ -159,6 +165,7 @@ namespace ComSquare::PPU
 
 	uint8_t PPU::read(uint24_t addr)
 	{
+		return 0;
 		switch (addr) {
 		case ppuRegisters::mpyl:
 			return  this->_registers._mpy.mpyl;
@@ -187,6 +194,7 @@ namespace ComSquare::PPU
 
 	void PPU::write(uint24_t addr, uint8_t data)
 	{
+		return;
 		switch (addr) {
 		case ppuRegisters::inidisp:
 			this->_registers._inidisp.raw = data;
@@ -211,8 +219,10 @@ namespace ComSquare::PPU
 		case ppuRegisters::bgmode:
 			this->_registers._bgmode.raw = data;
 			// update backgrounds
-			for (int i = 0; i < 8; i++)
+			for (int i = 0; i < 8; i++) {
+				this->_backgrounds[i].setBpp(this->getBPP((i / 2) + 1));
 				this->_backgrounds[i].setCharacterSize(this->getCharacterSize((i / 2) + 1));
+			}
 			break;
 		case ppuRegisters::mosaic:
 			this->_registers._mosaic.raw = data;
@@ -634,6 +644,9 @@ namespace ComSquare::PPU
 				this->_subScreen[i][j] = getRealColor(colorPalette);
 		// the buffer is overwrite if necessary by a new bg so the background priority is from back to front
 		// the starting palette index isn't implemented
+		this->addToMainSubScreen(this->_backgrounds[bgName::bg1NoPriority]);
+		this->addToMainSubScreen(this->_backgrounds[bgName::bg1Priority]);
+		return;
 		switch (this->_registers._bgmode.bgMode) {
 		case 0:
 			this->addToMainSubScreen(this->_backgrounds[bgName::bg4NoPriority]);