diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 925137f..7268557 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,3 +1,4 @@
+add_subdirectory(common)
 add_subdirectory(network)
 add_subdirectory(obpf)
 add_subdirectory(server)
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
new file mode 100644
index 0000000..82328c9
--- /dev/null
+++ b/src/common/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_library(common INTERFACE include/common/common.h)
+
+target_include_directories(common INTERFACE include)
diff --git a/src/obpf/include/obpf/action.h b/src/common/include/common/common.h
similarity index 83%
rename from src/obpf/include/obpf/action.h
rename to src/common/include/common/common.h
index 85ed6d2..7fbd52f 100644
--- a/src/obpf/include/obpf/action.h
+++ b/src/common/include/common/common.h
@@ -16,6 +16,8 @@ extern "C" {
         OBPF_ACTION_ALL_CLEAR,
     } ObpfAction;
 
+    typedef void (*ObpfActionHandler)(ObpfAction action, void* user_data);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/obpf/CMakeLists.txt b/src/obpf/CMakeLists.txt
index 2161e3c..e65d825 100644
--- a/src/obpf/CMakeLists.txt
+++ b/src/obpf/CMakeLists.txt
@@ -16,7 +16,6 @@ add_library(obpf
         lobby.cpp
         include/obpf/rotation.h
         include/obpf/stats.h
-        include/obpf/action.h
 )
 
 target_compile_definitions(obpf PRIVATE "simulator_EXPORTS")
@@ -28,6 +27,7 @@ target_link_libraries(obpf
         simulator
         network
         spdlog::spdlog
+        common
 )
 
 target_include_directories(obpf
diff --git a/src/obpf/include/obpf/rotation.h b/src/obpf/include/obpf/rotation.h
index adef98c..06a9823 100644
--- a/src/obpf/include/obpf/rotation.h
+++ b/src/obpf/include/obpf/rotation.h
@@ -1,9 +1,17 @@
 #pragma once
 
-typedef enum {
-    OBPF_ROTATION_NORTH = 0,
-    OBPF_ROTATION_EAST,
-    OBPF_ROTATION_SOUTH,
-    OBPF_ROTATION_WEST,
-    OBPF_ROTATION_LAST_ROTATION = OBPF_ROTATION_WEST,
-} ObpfRotation;
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    typedef enum {
+        OBPF_ROTATION_NORTH = 0,
+        OBPF_ROTATION_EAST,
+        OBPF_ROTATION_SOUTH,
+        OBPF_ROTATION_WEST,
+        OBPF_ROTATION_LAST_ROTATION = OBPF_ROTATION_WEST,
+    } ObpfRotation;
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/obpf/include/obpf/simulator.h b/src/obpf/include/obpf/simulator.h
index 085352e..2b06667 100644
--- a/src/obpf/include/obpf/simulator.h
+++ b/src/obpf/include/obpf/simulator.h
@@ -6,9 +6,9 @@
 extern "C" {
 #endif
 
+#include <common/common.h>
 #include <stdbool.h>
 #include <stdint.h>
-#include "action.h"
 #include "input.h"
 #include "rotation.h"
 #include "stats.h"
@@ -35,8 +35,6 @@ extern "C" {
         uint8_t bitmask;
     } ObpfKeyState;
 
-    typedef void (*ObpfActionHandler)(ObpfAction action, void* user_data);
-
     // clang-format off
 
     // Tetrion
@@ -64,6 +62,12 @@ extern "C" {
         struct ObpfTetrion const* tetrion,
         struct ObpfTetromino* out_tetromino
     );
+    OBPF_EXPORT bool obpf_tetrion_try_get_active_tetromino_transform(
+        struct ObpfTetrion const* tetrion,
+        ObpfTetrominoType* out_type,
+        ObpfRotation* out_rotation,
+        ObpfVec2* out_position
+    );
     OBPF_EXPORT bool obpf_tetrion_try_get_ghost_tetromino(
         struct ObpfTetrion const* tetrion,
         struct ObpfTetromino* out_tetromino
diff --git a/src/obpf/simulator.cpp b/src/obpf/simulator.cpp
index 589bfb7..f1abd6c 100644
--- a/src/obpf/simulator.cpp
+++ b/src/obpf/simulator.cpp
@@ -63,6 +63,31 @@ bool obpf_tetrion_try_get_active_tetromino(ObpfTetrion const* const tetrion, Obp
     return try_get_tetromino(tetrion, out_tetromino, TetrominoSelection::ActiveTetromino);
 }
 
+bool obpf_tetrion_try_get_active_tetromino_transform(
+    struct ObpfTetrion const* const tetrion,
+    ObpfTetrominoType* const out_type,
+    ObpfRotation* const out_rotation,
+    ObpfVec2* const out_position
+) {
+    auto const tetromino = tetrion->active_tetromino();
+    if (not tetromino.has_value()) {
+        return false;
+    }
+    if (out_type != nullptr) {
+        *out_type = static_cast<ObpfTetrominoType>(tetromino->type);
+    }
+    if (out_rotation != nullptr) {
+        *out_rotation = static_cast<ObpfRotation>(tetromino->rotation);
+    }
+    if (out_position != nullptr) {
+        *out_position = ObpfVec2{
+            gsl::narrow<std::uint8_t>(tetromino->position.x),
+            gsl::narrow<std::uint8_t>(tetromino->position.y),
+        };
+    }
+    return true;
+}
+
 bool obpf_tetrion_try_get_ghost_tetromino(ObpfTetrion const* tetrion, ObpfTetromino* out_tetromino) {
     return try_get_tetromino(tetrion, out_tetromino, TetrominoSelection::GhostTetromino);
 }
@@ -123,8 +148,7 @@ ObpfMinoPositions obpf_tetromino_get_mino_positions(ObpfTetrominoType const type
 }
 
 ObpfTetrominoType obpf_tetrion_get_hold_piece(ObpfTetrion const* const tetrion) {
-    auto const hold_piece = tetrion->hold_piece();
-    if (hold_piece.has_value()) {
+    if (auto const hold_piece = tetrion->hold_piece(); hold_piece.has_value()) {
         return static_cast<ObpfTetrominoType>(hold_piece.value());
     }
     return OBPF_TETROMINO_TYPE_EMPTY;
@@ -158,5 +182,5 @@ bool obpf_tetrion_is_game_over(ObpfTetrion const* const tetrion) {
 }
 
 void obpf_tetrion_set_action_handler(ObpfTetrion* const tetrion, ObpfActionHandler const handler, void* const user_data) {
-    tetrion->set_action_handler(reinterpret_cast<ObpfTetrion::ActionHandler>(handler), user_data);
+    tetrion->set_action_handler(handler, user_data);
 }
diff --git a/src/simulator/CMakeLists.txt b/src/simulator/CMakeLists.txt
index 12b06e6..46d972f 100644
--- a/src/simulator/CMakeLists.txt
+++ b/src/simulator/CMakeLists.txt
@@ -26,6 +26,8 @@ target_include_directories(simulator
 )
 
 target_link_libraries(simulator
+        PUBLIC
+        common
         PRIVATE
         obpf_simulator_project_options
 )
diff --git a/src/simulator/include/simulator/tetrion.hpp b/src/simulator/include/simulator/tetrion.hpp
index ec12841..9b9f2c7 100644
--- a/src/simulator/include/simulator/tetrion.hpp
+++ b/src/simulator/include/simulator/tetrion.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <common/common.h>
 #include <array>
 #include <cstdint>
 #include <lib2k/random.hpp>
@@ -19,14 +20,11 @@
 #include "tetromino.hpp"
 
 struct ObpfTetrion final {
-public:
-    using ActionHandler = void (*)(Action action, void* user_data);
-
 private:
     static constexpr auto spawn_position = Vec2{ 3, 0 };
     static constexpr auto spawn_rotation = Rotation::North;
 
-    ActionHandler m_action_handler = nullptr;
+    ObpfActionHandler m_action_handler = nullptr;
     void* m_action_handler_user_data = nullptr;
     Matrix m_matrix;
     std::optional<Tetromino> m_active_tetromino;
@@ -67,7 +65,7 @@ struct ObpfTetrion final {
         static_assert(std::same_as<std::remove_const_t<decltype(seed)>, c2k::Random::Seed>);
         m_lock_delay_state.set_on_touch_handler([this] {
             if (m_action_handler) {
-                m_action_handler(Action::Touch, m_action_handler_user_data);
+                m_action_handler(static_cast<ObpfAction>(Action::Touch), m_action_handler_user_data);
             }
         });
         spawn_next_tetromino();
@@ -78,7 +76,7 @@ struct ObpfTetrion final {
     ObpfTetrion& operator=(ObpfTetrion const& other) = delete;
     ObpfTetrion& operator=(ObpfTetrion&& other) noexcept = default;
 
-    void set_action_handler(ActionHandler const handler, void* const user_data) {
+    void set_action_handler(ObpfActionHandler const handler, void* const user_data) {
         m_action_handler = handler;
         m_action_handler_user_data = user_data;
     }
diff --git a/src/simulator/tetrion.cpp b/src/simulator/tetrion.cpp
index 6a142d0..05d33cb 100644
--- a/src/simulator/tetrion.cpp
+++ b/src/simulator/tetrion.cpp
@@ -355,7 +355,9 @@ void ObpfTetrion::rotate(RotationDirection const direction) {
             m_lock_delay_state.on_tetromino_moved(LockDelayMovementType::NotMovedDown);
             if (m_action_handler != nullptr) {
                 m_action_handler(
-                    direction == RotationDirection::Clockwise ? Action::RotateCW : Action::RotateCCW,
+                    static_cast<ObpfAction>(
+                        direction == RotationDirection::Clockwise ? Action::RotateCW : Action::RotateCCW
+                    ),
                     m_action_handler_user_data
                 );
             }
@@ -391,7 +393,7 @@ void ObpfTetrion::hard_drop() {
     m_lock_delay_state.on_hard_drop_lock();
 
     if (m_action_handler != nullptr) {
-        m_action_handler(Action::HardDrop, m_action_handler_user_data);
+        m_action_handler(static_cast<ObpfAction>(Action::HardDrop), m_action_handler_user_data);
     }
 }
 
@@ -424,7 +426,7 @@ void ObpfTetrion::determine_lines_to_clear() {
         m_line_clear_delay.start(lines_to_clear);
         if (m_action_handler) {
             m_action_handler(
-                static_cast<Action>(std::to_underlying(Action::Clear1) + lines_to_clear.size() - 1),
+                static_cast<ObpfAction>(std::to_underlying(Action::Clear1) + lines_to_clear.size() - 1),
                 m_action_handler_user_data
             );
         }
@@ -450,7 +452,7 @@ void ObpfTetrion::clear_lines(c2k::StaticVector<u8, 4> const lines) {
     }
     m_num_lines_cleared += gsl::narrow<decltype(m_num_lines_cleared)>(lines.size());
     if (m_matrix.is_empty() and m_action_handler != nullptr) {
-        m_action_handler(Action::AllClear, m_action_handler_user_data);
+        m_action_handler(static_cast<ObpfAction>(Action::AllClear), m_action_handler_user_data);
     }
 }
 
diff --git a/test/tetrion_tests.cpp b/test/tetrion_tests.cpp
index 1b80fe1..8b75133 100644
--- a/test/tetrion_tests.cpp
+++ b/test/tetrion_tests.cpp
@@ -1,23 +1,25 @@
 #include <gtest/gtest.h>
+#include <ranges>
 #include <simulator/tetrion.hpp>
 
 static constexpr u64 seed_for_tetromino_type(TetrominoType const type) {
     switch (type) {
-        case TetrominoType::I:
+        using enum TetrominoType;
+        case I:
             return 13;
-        case TetrominoType::J:
+        case J:
             return 10;
-        case TetrominoType::L:
+        case L:
             return 11;
-        case TetrominoType::O:
+        case O:
             return 1;
-        case TetrominoType::S:
+        case S:
             return 0;
-        case TetrominoType::T:
+        case T:
             return 22;
-        case TetrominoType::Z:
+        case Z:
             return 4;
-        case TetrominoType::Empty:
+        case Empty:
             throw std::runtime_error{ "Empty type cannot be spawned" };
     }
     throw std::runtime_error{ "Invalid TetrominoType" };
@@ -25,21 +27,22 @@ static constexpr u64 seed_for_tetromino_type(TetrominoType const type) {
 
 static constexpr char to_char(TetrominoType const type) {
     switch (type) {
-        case TetrominoType::Empty:
+        using enum TetrominoType;
+        case Empty:
             return ' ';
-        case TetrominoType::I:
+        case I:
             return 'I';
-        case TetrominoType::J:
+        case J:
             return 'J';
-        case TetrominoType::L:
+        case L:
             return 'L';
-        case TetrominoType::O:
+        case O:
             return 'O';
-        case TetrominoType::S:
+        case S:
             return 'S';
-        case TetrominoType::T:
+        case T:
             return 'T';
-        case TetrominoType::Z:
+        case Z:
             return 'Z';
     }
     throw std::runtime_error{ "Invalid TetrominoType" };
@@ -49,6 +52,9 @@ static constexpr char to_char(TetrominoType const type) {
     auto const active_minos =
         tetrion.active_tetromino().transform([](Tetromino const& tetromino) { return get_mino_positions(tetromino); });
 
+    using std::ranges::views::cartesian_product;
+    using std::ranges::views::iota;
+
     for (auto row = usize{ 0 }; row < Matrix::height; ++row) {
         for (auto column = usize{ 0 }; column < Matrix::width; ++column) {
             if (active_minos.has_value()) {
@@ -60,8 +66,7 @@ static constexpr char to_char(TetrominoType const type) {
                 }
             }
             std::cout << to_char(tetrion.matrix()[Vec2{ static_cast<i32>(column), static_cast<i32>(row) }]);
-next_column:  // 👈(ﾟヮﾟ👈)
-            (void)1;
+next_column:;  // 👈(ﾟヮﾟ👈)
         }
         std::cout << '\n';
     }
@@ -71,8 +76,8 @@ TEST(TetrionTests, AllClear) {
     auto tetrion = ObpfTetrion{ seed_for_tetromino_type(TetrominoType::I) };
     auto called_count = usize{ 0 };
     tetrion.set_action_handler(
-        [](Action const action, void* user_data) {
-            if (action == Action::AllClear) {
+        [](ObpfAction const action, void* user_data) {
+            if (action == static_cast<ObpfAction>(Action::AllClear)) {
                 *static_cast<usize*>(user_data) = true;
             }
         },