diff --git a/sources/CPU/CPU.hpp b/sources/CPU/CPU.hpp
index 1f6dd1c..7159174 100644
--- a/sources/CPU/CPU.hpp
+++ b/sources/CPU/CPU.hpp
@@ -391,6 +391,8 @@ namespace ComSquare::CPU
 		int RTL(uint24_t, AddressingMode);
 		//! @brief Compare Accumulator with Memory.
 		int CMP(uint24_t, AddressingMode);
+		//! @brief Increment
+		int INC(uint24_t, AddressingMode);
 
 		//! @brief All the instructions of the CPU.
 		//! @info Instructions are indexed by their opcode
@@ -421,7 +423,7 @@ namespace ComSquare::CPU
 			{&CPU::ORA, 6, "ora", AddressingMode::DirectPageIndirectIndexedByYLong, 2}, // 17
 			{&CPU::CLC, 2, "clc", AddressingMode::Implied, 1}, // 18
 			{&CPU::ORA, 4, "ora", AddressingMode::AbsoluteIndexedByY, 3}, // 19
-			{&CPU::BRK, 7, "inc #-#", AddressingMode::Implied, 2}, // 1A
+			{&CPU::INC, 2, "inc", AddressingMode::Implied, 1}, // 1A
 			{&CPU::BRK, 7, "tcs #-#", AddressingMode::Implied, 2}, // 1B
 			{&CPU::BRK, 7, "trb #-#", AddressingMode::Implied, 2}, // 1C
 			{&CPU::ORA, 4, "ora", AddressingMode::AbsoluteIndexedByX, 3}, // 1D
@@ -625,7 +627,7 @@ namespace ComSquare::CPU
 			{&CPU::SBC, 4, "sbc", AddressingMode::StackRelative, 2}, // E3
 			{&CPU::CPX, 3, "cpx", AddressingMode::DirectPage, 2}, // E4
 			{&CPU::SBC, 3, "sbc", AddressingMode::DirectPage, 2}, // E5
-			{&CPU::BRK, 7, "inc #-#", AddressingMode::Implied, 2}, // E6
+			{&CPU::INC, 5, "inc", AddressingMode::DirectPage, 2}, // E6
 			{&CPU::SBC, 6, "sbc", AddressingMode::DirectPageIndirectLong, 2}, // E7
 			{&CPU::INX, 2, "inx", AddressingMode::Implied, 1}, // E8
 			{&CPU::SBC, 2, "sbc", AddressingMode::ImmediateForA, 2}, // E9
@@ -633,7 +635,7 @@ namespace ComSquare::CPU
 			{&CPU::BRK, 7, "xba #-#", AddressingMode::Implied, 2}, // EB
 			{&CPU::CPX, 4, "cpx", AddressingMode::Absolute, 3}, // EC
 			{&CPU::SBC, 4, "sbc", AddressingMode::Absolute, 3}, // ED
-			{&CPU::BRK, 7, "inc #-#", AddressingMode::Implied, 2}, // EE
+			{&CPU::INC, 6, "inc", AddressingMode::Absolute, 3}, // EE
 			{&CPU::SBC, 5, "sbc", AddressingMode::AbsoluteLong, 4}, // EF
 			{&CPU::BEQ, 2, "beq", AddressingMode::Implied, 2}, // F0
 			{&CPU::SBC, 5, "sbc", AddressingMode::DirectPageIndirectIndexedByY, 2}, // F1
@@ -641,7 +643,7 @@ namespace ComSquare::CPU
 			{&CPU::SBC, 7, "sbc", AddressingMode::StackRelativeIndirectIndexedByY, 2}, // F3
 			{&CPU::BRK, 7, "pea #-#", AddressingMode::Implied, 2}, // F4
 			{&CPU::SBC, 4, "sbc", AddressingMode::DirectPageIndexedByX, 2}, // F5
-			{&CPU::BRK, 7, "inc #-#", AddressingMode::Implied, 2}, // F6
+			{&CPU::INC, 6, "inc", AddressingMode::DirectPageIndexedByX, 2}, // F6
 			{&CPU::SBC, 6, "sbc", AddressingMode::DirectPageIndirectIndexedByYLong, 2}, // F7
 			{&CPU::SED, 2, "sed", AddressingMode::Implied, 1}, // F8
 			{&CPU::SBC, 4, "sbc", AddressingMode::AbsoluteIndexedByY, 3}, // F9
@@ -649,7 +651,7 @@ namespace ComSquare::CPU
 			{&CPU::XCE, 2, "xce", AddressingMode::Implied, 1}, // FB
 			{&CPU::JSR, 8, "jsr", AddressingMode::AbsoluteIndirectIndexedByX, 3}, // FC
 			{&CPU::SBC, 4, "sbc", AddressingMode::AbsoluteIndexedByX, 3}, // FD
-			{&CPU::BRK, 7, "inc #-#", AddressingMode::Implied, 2}, // FE
+			{&CPU::INC, 7, "inc", AddressingMode::AbsoluteIndexedByX, 3}, // FE
 			{&CPU::SBC, 5, "sbc", AddressingMode::AbsoluteIndexedByXLong, 4}, // FF
 		};
 	public:
diff --git a/sources/CPU/Instructions/MathematicalOperations.cpp b/sources/CPU/Instructions/MathematicalOperations.cpp
index 35af999..df64f01 100644
--- a/sources/CPU/Instructions/MathematicalOperations.cpp
+++ b/sources/CPU/Instructions/MathematicalOperations.cpp
@@ -254,7 +254,7 @@ namespace ComSquare::CPU
 
 	int CPU::AND(uint24_t valueAddr, AddressingMode mode)
 	{
-		unsigned negativeMask = this->_isEmulationMode ? 0x80u : 0x8000u;
+		unsigned negativeMask = this->_registers.p.m ? 0x80u : 0x8000u;
 		unsigned value = this->_bus->read(valueAddr);
 		if (!this->_registers.p.m)
 			value += this->_bus->read(valueAddr + 1) << 8u;
@@ -285,4 +285,44 @@ namespace ComSquare::CPU
 		}
 		return cycles;
 	}
+
+	int CPU::INC(uint24_t valueAddr, AddressingMode mode)
+	{
+		unsigned negativeMask = this->_registers.p.m ? 0x80u : 0x8000u;
+
+		unsigned result;
+		if (mode == Implied) {
+			this->_registers.a++;
+			if (this->_registers.p.m)
+				this->_registers.ah = 0;
+			result = this->_registers.a;
+		} else if (!this->_registers.p.m) {
+			result = this->_bus->read(valueAddr);
+			result += this->_bus->read(valueAddr + 1) << 8u;
+			result = (uint16_t)(result + 1);
+			this->_bus->write(valueAddr, result);
+			this->_bus->write(valueAddr + 1, result << 8u);
+		} else {
+			result = this->_bus->read(valueAddr);
+			result = (uint8_t)(result + 1);
+			this->_bus->write(valueAddr, result);
+		}
+
+		this->_registers.p.z = result == 0;
+		this->_registers.p.n = result & negativeMask;
+
+		switch (mode) {
+		case Implied:
+			return 0;
+		case Absolute:
+			return this->_registers.p.m == 0 ? 2 : 0;
+		case DirectPage:
+		case DirectPageIndexedByX:
+			return (this->_registers.p.m == 0 ? 2 : 0) + this->_registers.dl != 0 ;
+		case AbsoluteIndexedByX:
+			return (this->_registers.p.m == 0 ? 2 : 0) + this->_hasIndexCrossedPageBoundary;
+		default:
+			return 0;
+		}
+	}
 }
\ No newline at end of file
diff --git a/tests/CPU/Math/testOthersMath.cpp b/tests/CPU/Math/testOthersMath.cpp
index 3a65f92..48364f2 100644
--- a/tests/CPU/Math/testOthersMath.cpp
+++ b/tests/CPU/Math/testOthersMath.cpp
@@ -152,4 +152,70 @@ Test(ORA, zero)
 	cr_assert_eq(snes.cpu->_registers.a, 0x00, "The accumulator's value should be 0x00 but it was 0x%x.", snes.cpu->_registers.a);
 	cr_assert_eq(snes.cpu->_registers.p.n, false, "The negative flags should not be set.");
 	cr_assert_eq(snes.cpu->_registers.p.z, true, "The zero flags should be set.");
+}
+
+Test(INC, simple)
+{
+	Init()
+	snes.cpu->_registers.p.m = true;
+	snes.wram->_data[0] = 0x56;
+	snes.cpu->INC(0x0, ComSquare::CPU::AddressingMode::Absolute);
+	cr_assert_eq(snes.wram->_data[0], 0x57, "The incremented value should be 0x57 but it was 0x%x.", snes.wram->_data[0]);
+	cr_assert_eq(snes.cpu->_registers.p.n, false, "The negative flags should not be set.");
+	cr_assert_eq(snes.cpu->_registers.p.z, false, "The zero flags should not be set.");
+}
+
+Test(INC, negative)
+{
+	Init()
+	snes.cpu->_registers.p.m = true;
+	snes.wram->_data[0] = 0x7F;
+	snes.cpu->INC(0x0, ComSquare::CPU::AddressingMode::Absolute);
+	cr_assert_eq(snes.wram->_data[0], 0x80, "The incremented value should be 0x80 but it was 0x%x.", snes.wram->_data[0]);
+	cr_assert_eq(snes.cpu->_registers.p.n, true, "The negative flags should be set.");
+	cr_assert_eq(snes.cpu->_registers.p.z, false, "The zero flags should not be set.");
+}
+
+Test(INC, accumulator)
+{
+	Init()
+	snes.cpu->_registers.p.m = true;
+	snes.cpu->_registers.a = 0x56;
+	snes.cpu->INC(0x0, ComSquare::CPU::AddressingMode::Implied);
+	cr_assert_eq(snes.cpu->_registers.a, 0x57, "The incremented value should be 0x57 but it was 0x%x.", snes.cpu->_registers.a);
+	cr_assert_eq(snes.cpu->_registers.p.n, false, "The negative flags should not be set.");
+	cr_assert_eq(snes.cpu->_registers.p.z, false, "The zero flags should not be set.");
+}
+
+Test(INC, negativeAccumulator)
+{
+	Init()
+	snes.cpu->_registers.p.m = true;
+	snes.cpu->_registers.a = 0x7F;
+	snes.cpu->INC(0x0, ComSquare::CPU::AddressingMode::Implied);
+	cr_assert_eq(snes.cpu->_registers.a, 0x80, "The incremented value should be 0x80 but it was 0x%x.", snes.cpu->_registers.a);
+	cr_assert_eq(snes.cpu->_registers.p.n, true, "The negative flags should be set.");
+	cr_assert_eq(snes.cpu->_registers.p.z, false, "The zero flags should not be set.");
+}
+
+Test(INC, nativeAccumulator)
+{
+	Init()
+	snes.cpu->_registers.p.m = false;
+	snes.cpu->_registers.a = 0x5600;
+	snes.cpu->INC(0x0, ComSquare::CPU::AddressingMode::Implied);
+	cr_assert_eq(snes.cpu->_registers.a, 0x5601, "The incremented value should be 0x5601 but it was 0x%x.", snes.cpu->_registers.a);
+	cr_assert_eq(snes.cpu->_registers.p.n, false, "The negative flags should not be set.");
+	cr_assert_eq(snes.cpu->_registers.p.z, false, "The zero flags should not be set.");
+}
+
+Test(INC, negativeNativeAccumulator)
+{
+	Init()
+	snes.cpu->_registers.p.m = false;
+	snes.cpu->_registers.a = 0x8FFF;
+	snes.cpu->INC(0x0, ComSquare::CPU::AddressingMode::Implied);
+	cr_assert_eq(snes.cpu->_registers.a, 0x9000, "The incremented value should be 0x9000 but it was 0x%x.", snes.cpu->_registers.a);
+	cr_assert_eq(snes.cpu->_registers.p.n, true, "The negative flags should be set.");
+	cr_assert_eq(snes.cpu->_registers.p.z, false, "The zero flags should not be set.");
 }
\ No newline at end of file