diff --git a/sources/PPU/Background.cpp b/sources/PPU/Background.cpp
index 07f90ba..5dd7bf1 100644
--- a/sources/PPU/Background.cpp
+++ b/sources/PPU/Background.cpp
@@ -11,14 +11,14 @@
 namespace ComSquare::PPU
 {
 	Background::Background(ComSquare::PPU::PPU &_ppu, int backGroundNumber, bool hasPriority):
-		priority(hasPriority),
-		bgNumber(backGroundNumber)
+		_priority(hasPriority),
+		_bgNumber(backGroundNumber)
 	{
 		_cgram = _ppu.cgram;
 		_vram = _ppu.vram;
 		_bpp = _ppu.getBPP(backGroundNumber);
 		_characterSize = _ppu.getCharacterSize(backGroundNumber);
-		_TileMapStartAddress = _ppu.getTileMapStartAddress(backGroundNumber);
+		_tileMapStartAddress = _ppu.getTileMapStartAddress(backGroundNumber);
 		_tilesetAddress = _ppu.getTilesetAddress(backGroundNumber);
 		_tileMaps = _ppu.getBackgroundSize(backGroundNumber);
 		_directColor = false;
@@ -26,9 +26,9 @@ namespace ComSquare::PPU
 	}
 
 
-	void Background::renderBackground(void)
+	void Background::renderBackground()
 	{
-		uint16_t vramAddress = this->_TileMapStartAddress;
+		uint16_t vramAddress = this->_tileMapStartAddress;
 		Vector2<int> offset(0, 0);
 		this->backgroundSize.x = this->_tileMaps.x * this->_characterSize.x * NB_CHARACTER_WIDTH;
 		this->backgroundSize.y = this->_tileMaps.y * this->_characterSize.y * NB_CHARACTER_HEIGHT;
@@ -69,7 +69,7 @@ namespace ComSquare::PPU
 			for (int j = 0; j < this->_characterSize.x; j++) {
 				reference = getPixelReferenceFromTile(graphicAddress, index);
 				color = getRealColor(palette[reference]);
-				if (tileData.tilePriority == this->priority) // reference 0 is considered as transparency
+				if (tileData.tilePriority == this->_priority) // reference 0 is considered as transparency
 					this->buffer[pos.x][pos.y] = (reference) ? color : 0;
 				index += (tileData.horizontalFlip) ? -1 : 1;
 				pos.x++;
@@ -161,7 +161,7 @@ namespace ComSquare::PPU
 
 	void Background::setTileMapStartAddress(uint16_t address)
 	{
-		this->_TileMapStartAddress = address;
+		this->_tileMapStartAddress = address;
 	}
 
 	void Background::setTilesetAddress(uint16_t address)
@@ -182,8 +182,28 @@ namespace ComSquare::PPU
 			this->_bpp = 2;
 	}
 
-	void Background::setTilemaps(Vector2<int> tilemaps)
+	void Background::setTilemaps(Vector2<int> tileMaps)
 	{
-		this->_tileMaps = tilemaps;
+		this->_tileMaps = tileMaps;
+	}
+
+	void Background::setBgNumber(int bgNumber)
+	{
+		this->_bgNumber = bgNumber;
+	}
+
+	int Background::getBgNumber() const
+	{
+		return this->_bgNumber;
+	}
+
+	void Background::setPriority(bool priority)
+	{
+		this->_priority = priority;
+	}
+
+	bool Background::getPriority() const
+	{
+		return this->_priority;
 	}
 }
\ No newline at end of file
diff --git a/sources/PPU/Background.hpp b/sources/PPU/Background.hpp
index feaaab5..89c66a6 100644
--- a/sources/PPU/Background.hpp
+++ b/sources/PPU/Background.hpp
@@ -29,8 +29,10 @@ namespace ComSquare::PPU
 		int _bpp;
 		bool _directColor;
 		bool _highRes;
-		uint16_t _TileMapStartAddress;
+		uint16_t _tileMapStartAddress;
 		uint16_t _tilesetAddress;
+		bool _priority;
+		int _bgNumber;
 
 		std::shared_ptr<Ram::Ram> _vram;
 		std::shared_ptr<Ram::Ram> _cgram;
@@ -50,20 +52,19 @@ namespace ComSquare::PPU
 		//! @param pixelIndex The index of the pixel (0 - 255)
 		//! @return The color reference
 		uint8_t getPixelReferenceFromTile(uint16_t tileAddress, uint8_t pixelIndex);
-		//! @brief draw a tilemap 32x32 starting at baseAddress
+		//! @brief draw a tileMap 32x32 starting at baseAddress
 		//! @param baseAddress The starting address of the tileMap
 		//! @param offset The rendering offeset in pixels
 		void drawBasicTileMap(uint16_t baseAddress, Vector2<int> offset);
 	public:
 		// TODO getter setter for priority and bgNumber
-		bool priority;
-		int bgNumber;
+
 		Vector2<int> backgroundSize;
 		std::array<std::array<uint32_t, 1024>, 1024> buffer;
 		Background(ComSquare::PPU::PPU &_ppu, int backGroundNumber, bool hasPriority);
 		//! @brief Render a background on his internal buffer
-		void renderBackground(void);
-		//! @brief Set the tilemap start address
+		void renderBackground();
+		//! @brief Set the tileMap start address
 		//! @param address TileMap start address
 		void setTileMapStartAddress(uint16_t address);
 		//! @brief Set the character Size
@@ -74,7 +75,21 @@ namespace ComSquare::PPU
 		//! @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);
-		void setTilemaps(Vector2<int> tilemaps);
+		//! @brief setter for private variable _tileMaps
+		//! @param tileMaps The tileMaps to set
+		void setTilemaps(Vector2<int> tileMaps);
+		//! @brief set the Background number
+		//! @param bgNumber the new Background Number
+		void setBgNumber(int bgNumber);
+		//! @brief Get the BackGround Number
+		//! @return the current Background number
+		int getBgNumber() const;
+		//! @brief set the Background priority
+		//! @param bgNumber the new Background priority
+		void setPriority(bool priority);
+		//! @brief Get the Background priority
+		//! @return the current Background priority
+		bool getPriority() const;
 	};
 }
 
diff --git a/sources/PPU/PPU.cpp b/sources/PPU/PPU.cpp
index b155ce3..ca69803 100644
--- a/sources/PPU/PPU.cpp
+++ b/sources/PPU/PPU.cpp
@@ -750,9 +750,9 @@ namespace ComSquare::PPU
 
 	void PPU::addToMainSubScreen(Background &bg)
 	{
-		if (this->_registers._t[0].raw & (1U << (bg.bgNumber - 1U)))
+		if (this->_registers._t[0].raw & (1U << (bg.getBgNumber() - 1U)))
 			this->add_buffer(this->_mainScreen, bg.buffer);
-		if (this->_registers._t[1].raw & (1U << (bg.bgNumber - 1U)))
+		if (this->_registers._t[1].raw & (1U << (bg.getBgNumber() - 1U)))
 			this->add_buffer(this->_subScreen, bg.buffer);
 	}
 }
\ No newline at end of file
diff --git a/ui/ui_cpu.h b/ui/ui_cpu.h
index 5bb8f98..35c8512 100644
--- a/ui/ui_cpu.h
+++ b/ui/ui_cpu.h
@@ -1,7 +1,7 @@
 /********************************************************************************
 ** Form generated from reading UI file 'cpu.ui'
 **
-** Created by: Qt User Interface Compiler version 5.13.2
+** Created by: Qt User Interface Compiler version 5.15.2
 **
 ** WARNING! All changes made in this file will be lost when recompiling UI file!
 ********************************************************************************/