diff --git a/src/command.rs b/src/command.rs
index ccfd833..e95781b 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -2,18 +2,20 @@ use std::{io, process::{Command, Output}};
 
 use tempfile::NamedTempFile;
 
-pub struct UMUCommand {
+pub struct UmuCommand {
     inner: Command,
-    file: NamedTempFile
 }
-impl UMUCommand {
-    pub fn new(inner: Command, file: NamedTempFile) -> Self {
+#[allow(dead_code)]
+impl UmuCommand {
+    pub fn new(inner: Command) -> Self {
         Self {
             inner,
-            file
         }
     }
-    pub fn run(&mut self) -> io::Result<Output> {
+    pub fn output(&mut self) -> io::Result<Output> {
         self.inner.output()
     }
+    pub fn spawn(&mut self) -> Result<std::process::Child, io::Error> {
+        self.inner.spawn()
+    }
 }
\ No newline at end of file
diff --git a/src/command_builder.rs b/src/command_builder.rs
index aa52254..bb38ece 100644
--- a/src/command_builder.rs
+++ b/src/command_builder.rs
@@ -1,76 +1,64 @@
-use std::{io::Write, path::PathBuf, process::Command};
+use std::{ffi::OsStr, io::Write, path::PathBuf, process::Command};
 
 use serde::Serialize;
 
-use crate::command::UMUCommand;
+use crate::command::UmuCommand;
 
 #[derive(Debug, Default, Clone, Serialize)]
-pub struct UMUCommandBuilder {
-    #[serde(skip)]
-    executable: PathBuf,
-    umu: UMU
-}
-#[serde(rename_all = "snake_case")]
-#[derive(Debug, Default, Clone, Serialize)]
-struct UMU {
+pub struct UmuCommandBuilder {
+    source: PathBuf,
+
+    program: String,
     game_id: Option<String>,
     wineprefix: Option<PathBuf>,
-    proton_executable: Option<PathBuf>,
-    winetricks_verbs: Option<Vec<String>>,
+    proton_path: Option<PathBuf>,
+    launch_args: Option<Vec<String>>,
     store: Option<String>,
-
 }
-
-impl UMUCommandBuilder {
-    pub fn new<T: Into<PathBuf>>(executable: T) -> Self {
+#[allow(dead_code)]
+impl UmuCommandBuilder {
+    pub fn new<T: Into<PathBuf>, D: Into<String>>(source: T, program: D) -> Self {
         Self {
-            executable: executable.into(),
+            source: source.into(),
+            program: program.into(),
             ..Default::default()
         }
     }
-    pub fn build(self) -> UMUCommand {
-        let mut file = tempfile::NamedTempFile::new().unwrap();
-        let serialized = toml::to_string(&self).unwrap();
-        println!("Serialized: \n{}", serialized);
-        file.write_all(serialized.as_bytes()).unwrap();
+    pub fn build(self) -> UmuCommand {
+        let mut command = Command::new(self.source);
 
-        let mut command = Command::new(self.executable);
-        command
-            .arg("--config")
-            .arg(file.path());
+        command.arg(self.program);
+        set_env(&mut command, "GAMEID", self.game_id);
+        set_env(&mut command, "PROTONPATH", self.proton_path);
+        set_env(&mut command, "WINEPREFIX", self.wineprefix);
+        //set_env(&mut command, "PROTON_VERB", self.proton_path);
+        set_env(&mut command, "STORE", self.store);
 
-        UMUCommand::new(command, file)
+        UmuCommand::new(command)
     }
     pub fn game_id(mut self, game_id: String) -> Self {
-        self.umu.game_id = Some(game_id);
+        self.game_id = Some(game_id);
         self
     }
     pub fn proton<T: Into<PathBuf>>(mut self, proton_executable: T) -> Self {
-        self.umu.proton_executable = Some(proton_executable.into());
-        self
-    }
-    pub fn verbs(mut self, winetricks_verbs: Vec<String>) -> Self {
-        self.umu.winetricks_verbs = Some(winetricks_verbs);
+        self.proton_path = Some(proton_executable.into());
         self
     }
     pub fn store(mut self, store: String) -> Self {
-        self.umu.store = Some(store);
+        self.store = Some(store);
         self
     }
     pub fn wineprefix(mut self, wineprefix: PathBuf) -> Self {
-        self.umu.wineprefix = Some(wineprefix);
+        self.wineprefix = Some(wineprefix);
+        self
+    }
+    pub fn launch_args(mut self, launch_args: Vec<String>) -> Self {
+        self.launch_args = Some(launch_args);
         self
     }
 }
-fn add_arg(a: &str, b: &str) -> String {
-    let mut s = String::new();
-    s.push_str(a);
-    s.push_str(b);
-    s
-}
-fn add_arg_pathbuf(a: &str, b: PathBuf) -> String {
-    let mut s = String::new();
-    s.push_str(a);
-    s.push_str(&b.into_os_string().into_string().unwrap());
-    s
+
+fn set_env<K: AsRef<OsStr>, V: AsRef<OsStr>>(command: &mut Command, key: K, variable: Option<V>) {
+    if variable.is_none() { return; }
+    command.env(key, variable.unwrap());
 }
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index 2bf08b7..0e2770a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,4 @@
+#[cfg(test)]
 mod tests;
 mod command;
 mod command_builder;
\ No newline at end of file
diff --git a/src/tests.rs b/src/tests.rs
index 09166b4..f80ece9 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -1,10 +1,26 @@
-use crate::command_builder::UMUCommandBuilder;
+use crate::command_builder::UmuCommandBuilder;
 
 
 #[test]
 pub fn print_sample() {
-    UMUCommandBuilder::new("/usr/bin/umu-run")
+    UmuCommandBuilder::new("/usr/bin/umu-run", "/home/quexeky/Downloads/Mini.Metro/setup_mini_metro_202101201241_(release-46)_(44304).exe")
         .game_id("0".to_owned())
         .wineprefix("~/.wine".into())
         .build();
 }
+
+#[test]
+pub fn local_test() {
+    let mut umu_command = UmuCommandBuilder::new("/usr/bin/umu-run", "/home/quexeky/Downloads/Mini.Metro/setup_mini_metro_202101201241_(release-46)_(44304).exe")
+        .game_id("0".into())
+        .wineprefix("~/.wine".into())
+        .build();
+    let child = umu_command
+        .spawn()
+        .unwrap();
+
+
+    println!("{:?}", child.wait_with_output().unwrap());
+
+
+}
\ No newline at end of file