diff --git a/CMakeLists.txt b/CMakeLists.txt
index 947d1d9..10a1462 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,9 +25,9 @@ add_subdirectory(${CMAKE_CURRENT_BINARY_DIR}/googletest-src
 
 file(GLOB_RECURSE test_src "test/**.h" "test/**.cpp" "src/**.h" "src/**.cpp")
 list(FILTER test_src EXCLUDE REGEX ".*/6502-emulator/src/main.cpp$")
-add_executable(6502_emulator_test ${test_src} test/test-utils.h)
+add_executable(6502_emulator_test ${test_src})
 target_link_libraries(6502_emulator_test gtest_main)
 add_test(NAME run_tests COMMAND 6502_emulator_test)
 
 file(GLOB_RECURSE emulator_src "src/**.h" "src/**.cpp")
-add_executable(6502_emulator ${emulator_src} src/utils.cpp)
\ No newline at end of file
+add_executable(6502_emulator ${emulator_src})
\ No newline at end of file
diff --git a/src/opcode/handler/store-opcode-handler-container.cpp b/src/opcode/handler/store-opcode-handler-container.cpp
new file mode 100644
index 0000000..7ccb832
--- /dev/null
+++ b/src/opcode/handler/store-opcode-handler-container.cpp
@@ -0,0 +1,72 @@
+#include "store-opcode-handler-container.h"
+#include "../../utils.h"
+
+namespace emu_6502 {
+    StoreOpcodeHandlerContainer::StoreOpcodeHandlerContainer() : OpcodeHandlerContainer() {
+        handlers.insert({Op::STA_ZPG, [this](Machine& machine) { st_zpg(machine, machine.get_cpu().get_a()); }});
+        handlers.insert({Op::STA_ZPG_X, [this](Machine& machine) { st_zpg_x(machine, machine.get_cpu().get_a()); }});
+        handlers.insert({Op::STA_ABS, [this](Machine& machine) { st_abs(machine, machine.get_cpu().get_a()); }});
+        handlers.insert({Op::STA_ABS_X, [this](Machine& machine) { st_abs_x(machine, machine.get_cpu().get_a()); }});
+        handlers.insert({Op::STA_ABS_Y, [this](Machine& machine) { st_abs_y(machine, machine.get_cpu().get_a()); }});
+        handlers.insert({Op::STA_IND_X, [this](Machine& machine) { st_ind_x(machine, machine.get_cpu().get_a()); }});
+        handlers.insert({Op::STA_IND_Y, [this](Machine& machine) { st_ind_y(machine, machine.get_cpu().get_a()); }});
+
+        handlers.insert({Op::STX_ZPG, [this](Machine& machine) { st_zpg(machine, machine.get_cpu().get_x()); }});
+        handlers.insert({Op::STX_ZPG_Y, [this](Machine& machine) { st_zpg_y(machine, machine.get_cpu().get_x()); }});
+        handlers.insert({Op::STX_ABS, [this](Machine& machine) { st_abs(machine, machine.get_cpu().get_x()); }});
+
+        handlers.insert({Op::STY_ZPG, [this](Machine& machine) { st_zpg(machine, machine.get_cpu().get_y()); }});
+        handlers.insert({Op::STY_ZPG_X, [this](Machine& machine) { st_zpg_x(machine, machine.get_cpu().get_y()); }});
+        handlers.insert({Op::STY_ABS, [this](Machine& machine) { st_abs(machine, machine.get_cpu().get_y()); }});
+    }
+
+    void StoreOpcodeHandlerContainer::store_to(Machine& machine, Register<uint8_t>& reg, uint16_t address) {
+        machine.get_memory().set_at(address, reg.get_value());
+    }
+
+    void StoreOpcodeHandlerContainer::st_zpg(Machine& machine, Register<uint8_t>& reg) {
+        auto addr = get_zpg_address(machine.read_program_byte());
+        store_to(machine, reg, addr);
+    }
+
+    void StoreOpcodeHandlerContainer::st_zpg_x(Machine& machine, Register<uint8_t>& reg) {
+        auto addr = get_zpg_x_address(machine.read_program_byte(), machine.get_cpu());
+        store_to(machine, reg, addr);
+    }
+
+    void StoreOpcodeHandlerContainer::st_zpg_y(Machine& machine, Register<uint8_t>& reg) {
+        auto addr = get_zpg_y_address(machine.read_program_byte(), machine.get_cpu());
+        store_to(machine, reg, addr);
+    }
+
+    void StoreOpcodeHandlerContainer::st_abs(Machine& machine, Register<uint8_t>& reg) {
+        auto low = machine.read_program_byte();
+        auto high = machine.read_program_byte();
+        auto addr = get_abs_address(low, high);
+        store_to(machine, reg, addr);
+    }
+
+    void StoreOpcodeHandlerContainer::st_abs_x(Machine& machine, Register<uint8_t>& reg) {
+        auto low = machine.read_program_byte();
+        auto high = machine.read_program_byte();
+        auto addr = get_abs_x_address(low, high, machine.get_cpu());
+        store_to(machine, reg, addr);
+    }
+
+    void StoreOpcodeHandlerContainer::st_abs_y(Machine& machine, Register<uint8_t>& reg) {
+        auto low = machine.read_program_byte();
+        auto high = machine.read_program_byte();
+        auto addr = get_abs_y_address(low, high, machine.get_cpu());
+        store_to(machine, reg, addr);
+    }
+
+    void StoreOpcodeHandlerContainer::st_ind_x(Machine& machine, Register<uint8_t>& reg) {
+        auto addr = get_ind_x_address(machine.read_program_byte(), machine);
+        store_to(machine, reg, addr);
+    }
+
+    void StoreOpcodeHandlerContainer::st_ind_y(Machine& machine, Register<uint8_t>& reg) {
+        auto addr = get_ind_y_address(machine.read_program_byte(), machine);
+        store_to(machine, reg, addr);
+    }
+}
\ No newline at end of file
diff --git a/src/opcode/handler/store-opcode-handler-container.h b/src/opcode/handler/store-opcode-handler-container.h
new file mode 100644
index 0000000..0ef1567
--- /dev/null
+++ b/src/opcode/handler/store-opcode-handler-container.h
@@ -0,0 +1,52 @@
+#ifndef INC_6502_EMULATOR_STORE_OPCODE_HANDLER_CONTAINER_H
+#define INC_6502_EMULATOR_STORE_OPCODE_HANDLER_CONTAINER_H
+
+#include "opcode-handler-container.h"
+#include "../../machine/machine.h"
+
+#include <unordered_map>
+#include <memory>
+#include <functional>
+
+using namespace std;
+
+namespace emu_6502 {
+    class StoreOpcodeHandlerContainer : public OpcodeHandlerContainer {
+    private:
+        enum Op {
+            STA_ZPG = 0x85,
+            STA_ZPG_X = 0x95,
+            STA_ABS = 0x8D,
+            STA_ABS_X = 0x9D,
+            STA_ABS_Y = 0x99,
+            STA_IND_X = 0x81,
+            STA_IND_Y = 0x91,
+
+            STX_ZPG = 0x86,
+            STX_ZPG_Y = 0x96,
+            STX_ABS = 0x8E,
+
+            STY_ZPG = 0x84,
+            STY_ZPG_X = 0x94,
+            STY_ABS = 0x8C,
+        };
+
+        void store_to(Machine& machine, Register<uint8_t>& reg, uint16_t address);
+
+        void st_zpg(Machine& machine, Register<uint8_t>& reg);
+        void st_zpg_x(Machine& machine, Register<uint8_t>& reg);
+        void st_zpg_y(Machine& machine, Register<uint8_t>& reg);
+        void st_abs(Machine& machine, Register<uint8_t>& reg);
+        void st_abs_x(Machine& machine, Register<uint8_t>& reg);
+        void st_abs_y(Machine& machine, Register<uint8_t>& reg);
+        void st_ind_x(Machine& machine, Register<uint8_t>& reg);
+        void st_ind_y(Machine& machine, Register<uint8_t>& reg);
+
+    public:
+        StoreOpcodeHandlerContainer();
+        StoreOpcodeHandlerContainer(const StoreOpcodeHandlerContainer& other) = delete;
+    };
+}
+
+
+#endif //INC_6502_EMULATOR_STORE_OPCODE_HANDLER_CONTAINER_H
diff --git a/src/opcode/opcode-handler-directory.cpp b/src/opcode/opcode-handler-directory.cpp
index 8e7dd5b..3edeb67 100644
--- a/src/opcode/opcode-handler-directory.cpp
+++ b/src/opcode/opcode-handler-directory.cpp
@@ -1,11 +1,13 @@
 #include "opcode-handler-directory.h"
 #include "handler/load-opcode-handler-container.h"
+#include "handler/store-opcode-handler-container.h"
 #include "../utils.h"
 
 namespace emu_6502 {
 
     OpcodeHandlerDirectory::OpcodeHandlerDirectory() : handler_containers{}, handlers{} {
         handler_containers.push_back(make_unique<LoadOpcodeHandlerContainer>());
+        handler_containers.push_back(make_unique<StoreOpcodeHandlerContainer>());
 
         init_handlers();
     }
diff --git a/test/store-opcode-handler-test.cpp b/test/store-opcode-handler-test.cpp
new file mode 100644
index 0000000..27b376a
--- /dev/null
+++ b/test/store-opcode-handler-test.cpp
@@ -0,0 +1,231 @@
+#include "gtest/gtest.h"
+#include "test-utils.h"
+
+#include <memory>
+#include <vector>
+
+using namespace std;
+using namespace emu_6502;
+
+const uint8_t STA_ZPG = 0x85;
+const uint8_t STA_ZPG_X = 0x95;
+const uint8_t STA_ABS = 0x8D;
+const uint8_t STA_ABS_X = 0x9D;
+const uint8_t STA_ABS_Y = 0x99;
+const uint8_t STA_IND_X = 0x81;
+const uint8_t STA_IND_Y = 0x91;
+
+const uint8_t STX_ZPG = 0x86;
+const uint8_t STX_ZPG_Y = 0x96;
+const uint8_t STX_ABS = 0x8E;
+
+const uint8_t STY_ZPG = 0x84;
+const uint8_t STY_ZPG_X = 0x94;
+const uint8_t STY_ABS = 0x8C;
+
+TEST(StoreOpcodeHandlerContainer, STA_ZPG) {
+    auto machine = create_machine({STA_ZPG, 0xe5});
+    machine->get_cpu().get_a().set_value(0x9d);
+    machine->execute();
+
+    ASSERT_EQ(0x9d, machine->get_memory().get_at(0xe5));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STA_ZPG_FlagsUnaffected) {
+    auto machine = create_machine({STA_ZPG, 0xe5});
+    machine->get_cpu().get_a().set_value(0x9d);
+
+    auto& ps = machine->get_cpu().get_ps();
+    ps.set_overflow(true);
+    ps.set_zero(true);
+    ps.set_negative(true);
+    ps.set_carry(true);
+    ps.set_break(true);
+    ps.set_decimal(true);
+    ps.set_interupt_disable(true);
+
+    machine->execute();
+
+    ASSERT_EQ(0x9d, machine->get_memory().get_at(0xe5));
+
+    RegisterFlagSet flags{};
+    flags.overflow = true;
+    flags.zero = true;
+    flags.negative = true;
+    flags.carry = true;
+    flags.brk = true;
+    flags.decimal = true;
+    flags.interupt_disable = true;
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), flags));
+}
+
+TEST(StoreOpcodeHandlerContainer, STA_ZPG_X) {
+    auto machine = create_machine({STA_ZPG_X, 0x10});
+    machine->get_cpu().get_x().set_value(0x15);
+    machine->get_cpu().get_a().set_value(0x4f);
+    machine->execute();
+
+    ASSERT_EQ(0x4f, machine->get_memory().get_at(0x25));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STA_ZPG_X_Wrap) {
+    auto machine = create_machine({STA_ZPG_X, 0xFF});
+    machine->get_cpu().get_x().set_value(0x80);
+    machine->get_cpu().get_a().set_value(0x4f);
+    machine->execute();
+
+    ASSERT_EQ(0x4f, machine->get_memory().get_at(0x7F));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STA_ABS) {
+    auto machine = create_machine({STA_ABS, 0x55, 0x66});
+    machine->get_cpu().get_a().set_value(0x10);
+    machine->execute();
+
+    ASSERT_EQ(0x10, machine->get_memory().get_at(0x6655));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STA_ABS_X) {
+    auto machine = create_machine({STA_ABS_X, 0x55, 0x66});
+    machine->get_cpu().get_x().set_value(0x4);
+    machine->get_cpu().get_a().set_value(0x10);
+    machine->execute();
+
+    ASSERT_EQ(0x10, machine->get_memory().get_at(0x6659));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STA_ABS_Y) {
+    auto machine = create_machine({STA_ABS_Y, 0x55, 0x66});
+    machine->get_cpu().get_y().set_value(0x4);
+    machine->get_cpu().get_a().set_value(0x10);
+    machine->execute();
+
+    ASSERT_EQ(0x10, machine->get_memory().get_at(0x6659));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STA_IND_X) {
+    auto machine = create_machine({STA_IND_X, 0x55});
+    machine->get_cpu().get_x().set_value(0x4);
+    machine->get_cpu().get_a().set_value(0x33);
+
+    // pointer
+    machine->get_memory().set_at(0x59, 0x3c);
+    machine->get_memory().set_at(0x5A, 0x4d);
+
+    machine->execute();
+
+    ASSERT_EQ(0x33, machine->get_memory().get_at(0x4d3c));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STA_IND_X_Wrap) {
+    auto machine = create_machine({STA_IND_X, 0xFF});
+    machine->get_cpu().get_x().set_value(0x6b);
+    machine->get_cpu().get_a().set_value(0x33);
+
+    // pointer
+    machine->get_memory().set_at(0x6a, 0x3c);
+    machine->get_memory().set_at(0x6b, 0x4d);
+
+    machine->execute();
+
+    ASSERT_EQ(0x33, machine->get_memory().get_at(0x4d3c));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STA_IND_Y) {
+    auto machine = create_machine({STA_IND_Y, 0x55});
+    machine->get_memory().set_at(0x55, 0x12);
+    machine->get_memory().set_at(0x56, 0x34);
+
+    machine->get_cpu().get_y().set_value(0x1a);
+    machine->get_cpu().get_a().set_value(0x33);
+
+    machine->execute();
+
+    ASSERT_EQ(0x33, machine->get_memory().get_at(0x342c));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STX_ZPG) {
+    auto machine = create_machine({STX_ZPG, 123});
+    machine->get_cpu().get_x().set_value(78);
+    machine->execute();
+
+    ASSERT_EQ(78, machine->get_memory().get_at(123));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STX_ZPG_Y) {
+    auto machine = create_machine({STX_ZPG_Y, 0x10});
+    machine->get_cpu().get_y().set_value(0x15);
+    machine->get_cpu().get_x().set_value(78);
+    machine->execute();
+
+    ASSERT_EQ(78, machine->get_memory().get_at(0x25));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STX_ZPG_Y_Wrap) {
+    auto machine = create_machine({STX_ZPG_Y, 0xFF});
+    machine->get_cpu().get_y().set_value(0x80);
+    machine->get_cpu().get_x().set_value(78);
+    machine->execute();
+
+    ASSERT_EQ(78, machine->get_memory().get_at(0x7F));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STX_ABS) {
+    auto machine = create_machine({STX_ABS, 0x55, 0x66});
+    machine->get_cpu().get_x().set_value(0x10);
+    machine->execute();
+
+    ASSERT_EQ(0x10, machine->get_memory().get_at(0x6655));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STY_ZPG) {
+    auto machine = create_machine({STY_ZPG, 123});
+    machine->get_cpu().get_y().set_value(78);
+    machine->execute();
+
+    ASSERT_EQ(78, machine->get_memory().get_at(123));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STY_ZPG_X) {
+    auto machine = create_machine({STY_ZPG_X, 0x10});
+    machine->get_cpu().get_x().set_value(0x15);
+    machine->get_cpu().get_y().set_value(78);
+    machine->execute();
+
+    ASSERT_EQ(78, machine->get_memory().get_at(0x25));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STY_ZPG_X_Wrap) {
+    auto machine = create_machine({STY_ZPG_X, 0xFF});
+    machine->get_cpu().get_x().set_value(0x80);
+    machine->get_cpu().get_y().set_value(78);
+    machine->execute();
+
+    ASSERT_EQ(78, machine->get_memory().get_at(0x7F));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
+TEST(StoreOpcodeHandlerContainer, STY_ABS) {
+    auto machine = create_machine({STY_ABS, 0x55, 0x66});
+    machine->get_cpu().get_y().set_value(0x10);
+    machine->execute();
+
+    ASSERT_EQ(0x10, machine->get_memory().get_at(0x6655));
+    ASSERT_TRUE(are_flags_set(machine->get_cpu().get_ps(), RegisterFlagSet{}));
+}
+
diff --git a/test/test-utils.cpp b/test/test-utils.cpp
new file mode 100644
index 0000000..13ae7d8
--- /dev/null
+++ b/test/test-utils.cpp
@@ -0,0 +1,19 @@
+#include "test-utils.h"
+
+unique_ptr<Machine> create_machine(vector<uint8_t> code) {
+    auto machine = make_unique<Machine>();
+    machine->load(code, 0x600);
+
+    return machine;
+}
+
+bool are_flags_set(const StatusRegister& reg, const RegisterFlagSet& flags) {
+    return
+            flags.carry == reg.is_carry_set() &&
+            flags.zero == reg.is_zero_set() &&
+            flags.interupt_disable == reg.is_interupt_disable_set() &&
+            flags.decimal == reg.is_interupt_disable_set() &&
+            flags.brk == reg.is_break_set() &&
+            flags.overflow == reg.is_overflow_set() &&
+            flags.negative == reg.is_negative_set();
+}
diff --git a/test/test-utils.h b/test/test-utils.h
index 1cffa61..df9d22e 100644
--- a/test/test-utils.h
+++ b/test/test-utils.h
@@ -1,3 +1,6 @@
+#ifndef INC_6502_EMULATOR_TEST_UTILS_H
+#define INC_6502_EMULATOR_TEST_UTILS_H
+
 #include "../src/opcode/opcode-handler-directory.h"
 #include "../src/machine/status-register.h"
 
@@ -17,20 +20,7 @@ struct RegisterFlagSet {
     bool negative;
 };
 
-unique_ptr<Machine> create_machine(vector<uint8_t> code) {
-    auto machine = make_unique<Machine>();
-    machine->load(code, 0x600);
+unique_ptr<Machine> create_machine(vector<uint8_t> code);
+bool are_flags_set(const StatusRegister& reg, const RegisterFlagSet& flags);
 
-    return machine;
-}
-
-bool are_flags_set(const StatusRegister& reg, const RegisterFlagSet& flags) {
-    return
-            flags.carry == reg.is_carry_set() &&
-            flags.zero == reg.is_zero_set() &&
-            flags.interupt_disable == reg.is_interupt_disable_set() &&
-            flags.decimal == reg.is_interupt_disable_set() &&
-            flags.brk == reg.is_break_set() &&
-            flags.overflow == reg.is_overflow_set() &&
-            flags.negative == reg.is_negative_set();
-}
\ No newline at end of file
+#endif
\ No newline at end of file