diff --git a/src/mercury_engine_data_structures/formats/bmtun.py b/src/mercury_engine_data_structures/formats/bmtun.py
index 4dc1912..14667c8 100644
--- a/src/mercury_engine_data_structures/formats/bmtun.py
+++ b/src/mercury_engine_data_structures/formats/bmtun.py
@@ -48,3 +48,20 @@ class Bmtun(BaseResource):
     @functools.lru_cache
     def construct_class(cls, target_game: Game) -> Construct:
         return BMTUN
+
+    def _check_tunable_exists(self, class_name: str, tunable_name: str) -> None:
+        classes = self.raw.classes
+        if class_name not in classes:
+            raise KeyError(f"Unknown class name: {class_name}!")
+        if tunable_name not in classes[class_name].tunables:
+            raise KeyError(f"Unknown tunable name for {class_name}: {tunable_name}!")
+
+    Tunable = str | float | bool | int | list[float]
+
+    def get_tunable(self, class_name: str, tunable_name: str) -> Tunable:
+        self._check_tunable_exists(class_name, tunable_name)
+        return self.raw.classes[class_name].tunables[tunable_name].value
+
+    def set_tunable(self, class_name: str, tunable_name: str, value: Tunable) -> None:
+        self._check_tunable_exists(class_name, tunable_name)
+        self.raw.classes[class_name].tunables[tunable_name].value = value
diff --git a/tests/formats/test_bmtun.py b/tests/formats/test_bmtun.py
index 8092b4d..fecc086 100644
--- a/tests/formats/test_bmtun.py
+++ b/tests/formats/test_bmtun.py
@@ -10,3 +10,28 @@
 @pytest.mark.parametrize("bmtun_path", samus_returns_data.all_files_ending_with(".bmtun"))
 def test_bmtun(samus_returns_tree, bmtun_path):
     parse_build_compare_editor(Bmtun, samus_returns_tree, bmtun_path)
+
+
+@pytest.fixture()
+def bmtun(samus_returns_tree) -> Bmtun:
+    return samus_returns_tree.get_parsed_asset("system/tunables/tunables.bmtun", type_hint=Bmtun)
+
+
+def test_get_tunable(bmtun):
+    assert bmtun.get_tunable("Amiibo|CTunableReserveTanks", "fLifeTankSize") == 299.0
+
+    with pytest.raises(KeyError):
+        bmtun.get_tunable("CTunableAbilityScanningPulse", "iRange")
+
+
+def test_set_tunable(bmtun):
+    bmtun.set_tunable("Amiibo|CTunableReserveTanks", "fLifeTankSize", 199.0)
+    assert bmtun.get_tunable("Amiibo|CTunableReserveTanks", "fLifeTankSize") == 199.0
+
+    bmtun.set_tunable("CTunableMissile", "sDamageSource", "BOMB")
+    assert bmtun.get_tunable("CTunableMissile", "sDamageSource") == "BOMB"
+
+    with pytest.raises(KeyError, match="Unknown tunable name for Amiibo|CTunableReserveTanks: FakeTunable!"):
+        bmtun.set_tunable("Amiibo|CTunableReserveTanks", "FakeTunable", 10.0)
+    with pytest.raises(KeyError, match="Unknown class name: FakeClass!"):
+        bmtun.set_tunable("FakeClass", "FakeTunable", 10.0)