diff --git a/Cargo.toml b/Cargo.toml
index d5e6c4b..982f8f9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,7 +31,7 @@ mlua = { version = "0.9.8", features = [
     "vendored",
     "send",
 ], optional = true }
-magnus = { version = "0.7.1", optional = true }
+magnus = { version = "0.7.1", optional = true, features = ["embed"] }
 
 [[example]]
 name = "call_function_from_rust_rhai"
diff --git a/assets/tests/ruby/script_function_gets_called_from_rust.rb b/assets/tests/ruby/script_function_gets_called_from_rust.rb
new file mode 100644
index 0000000..aaf3683
--- /dev/null
+++ b/assets/tests/ruby/script_function_gets_called_from_rust.rb
@@ -0,0 +1,7 @@
+$state = {
+  times_called: 0
+}
+
+def test_func
+  $state[:times_called] += 1
+end
diff --git a/src/lib.rs b/src/lib.rs
index 5f23c69..37fcc75 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -259,7 +259,11 @@ use std::{
     sync::{Arc, Mutex},
 };
 
-use bevy::{app::MainScheduleOrder, ecs::{component::Mutable, schedule::ScheduleLabel}, prelude::*};
+use bevy::{
+    app::MainScheduleOrder,
+    ecs::{component::Mutable, schedule::ScheduleLabel},
+    prelude::*,
+};
 use callback::{Callback, IntoCallbackSystem};
 use systems::{init_callbacks, log_errors, process_calls};
 use thiserror::Error;
@@ -269,7 +273,7 @@ use self::{
     systems::{process_new_scripts, reload_scripts},
 };
 
-#[cfg(any(feature = "rhai", feature = "lua"))]
+#[cfg(any(feature = "rhai", feature = "lua", feature = "ruby"))]
 const ENTITY_VAR_NAME: &str = "entity";
 
 /// An error that can occur when internal [ScriptingPlugin] systems are being executed
diff --git a/src/runtimes/ruby.rs b/src/runtimes/ruby.rs
index 293b67a..66f9afc 100644
--- a/src/runtimes/ruby.rs
+++ b/src/runtimes/ruby.rs
@@ -1,8 +1,17 @@
+use std::{
+    cell::{LazyCell, OnceCell},
+    sync::{LazyLock, Mutex, OnceLock},
+};
+
 use bevy::{
     asset::Asset,
     ecs::{component::Component, entity::Entity, resource::Resource, schedule::ScheduleLabel},
     reflect::TypePath,
 };
+use magnus::{
+    embed::{init, Cleanup},
+    prelude::*,
+};
 use serde::Deserialize;
 
 use crate::{
@@ -25,18 +34,37 @@ pub struct RubyScriptData;
 
 impl GetExtensions for RubyScript {
     fn extensions() -> &'static [&'static str] {
-        todo!()
+        &["rb"]
     }
 }
 
 impl From<String> for RubyScript {
     fn from(value: String) -> Self {
-        todo!()
+        Self(value)
     }
 }
 
+fn hello(subject: String) -> String {
+    format!("hello, {}", subject)
+}
+
+struct RubyEngine(Cleanup);
+
+unsafe impl Send for RubyEngine {}
+
+static RUBY_ENGINE: OnceLock<Mutex<RubyEngine>> = OnceLock::new();
+
 impl Default for RubyRuntime {
     fn default() -> Self {
+        RUBY_ENGINE.get_or_init(|| Mutex::new(RubyEngine(unsafe { magnus::embed::init() })));
+        // TODO: Add SAFETY?
+
+        // engine.define_global_function("hello", magnus::function!(hello, 1));
+        // engine
+        //     .eval::<magnus::value::Qnil>(r#"puts hello("world")"#)
+        //     .unwrap();
+        //
+        // Self { engine }
         Self {}
     }
 }
@@ -70,7 +98,11 @@ impl Runtime for RubyRuntime {
         script: &Self::ScriptAsset,
         entity: bevy::prelude::Entity,
     ) -> Result<Self::ScriptData, crate::ScriptingError> {
-        todo!()
+        let engine =
+            RUBY_ENGINE.get_or_init(|| Mutex::new(RubyEngine(unsafe { magnus::embed::init() })));
+        let engine = engine.lock().unwrap();
+        engine.0.eval::<magnus::value::Qnil>(&script.0);
+        Ok(RubyScriptData)
     }
 
     fn register_fn(
@@ -97,7 +129,11 @@ impl Runtime for RubyRuntime {
         entity: bevy::prelude::Entity,
         args: impl for<'a> crate::FuncArgs<'a, Self::Value, Self>,
     ) -> Result<Self::Value, crate::ScriptingError> {
-        todo!()
+        let engine =
+            RUBY_ENGINE.get_or_init(|| Mutex::new(RubyEngine(unsafe { magnus::embed::init() })));
+        let ruby = magnus::Ruby::get().unwrap();
+        let _: magnus::value::Value = ruby.class_object().funcall(name, ()).unwrap();
+        todo!();
     }
 
     fn call_fn_from_value(
diff --git a/tests/tests.rs b/tests/tests.rs
index 0744ec6..1b98a95 100644
--- a/tests/tests.rs
+++ b/tests/tests.rs
@@ -297,7 +297,7 @@ macro_rules! scripting_tests {
         }
 
         #[test]
-        fn test_script_function_gets_called_from_rust() {
+        fn test_script_function_gets_called_from_rust_without_params() {
             let mut app = build_test_app();
 
             app.add_scripting::<$runtime>(|_| {});