diff --git a/Cargo.toml b/Cargo.toml
index 6c8130c..6477ca2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,9 +7,6 @@ edition = "2018"
 [dependencies]
 ncurses = "5.99.0"
 
-[profile.release]
-debug = true
-
 [[bin]]
 name = "day1"
 path = "src/day1/main.rs"
diff --git a/src/day13/main.rs b/src/day13/main.rs
index 840e5f9..f0c3a94 100644
--- a/src/day13/main.rs
+++ b/src/day13/main.rs
@@ -1,4 +1,5 @@
 use aoc2019::intcode;
+use std::cmp::Ordering;
 use std::collections::HashMap;
 use std::error::Error;
 use std::fs::File;
@@ -24,32 +25,65 @@ fn main() -> Result<(), Box<dyn Error>> {
     println!("blocks: {}", blocks);
 
     // part2
-    let mut computer = computer.clone_with_modified_program(vec![(0, 2)]);
     ncurses::initscr();
     ncurses::noecho();
-    loop {
-        while let Some(output) = &computer.run_until_input() {
+    let mut computer = computer.clone_with_modified_program(vec![(0, 2)]);
+    let mut paddlex = 0;
+    let mut score = 0;
+    while !computer.halted {
+        if let Some(output) = &computer.run_until_input() {
             output.chunks(3).for_each(|c| {
-                let mut score = 0;
                 if let &[x, y, value] = c {
                     if x == -1 && y == 0 {
                         score = value;
                     } else {
                         let tile = Tile::from(value);
+                        if Tile::from(value) == Tile::HorizontalPaddle {
+                            paddlex = x;
+                        }
                         ncurses::mvprintw((y + 1) as i32, x as i32, tile.char());
                     }
-                    ncurses::mvprintw(0, 0, &format!("score: {}", score));
                 }
             });
         }
-        ncurses::refresh();
-        let joystick = match ncurses::getch() {
-            104 => -1,
-            108 => 1,
-            _ => 0,
+        let np = next_pos(&mut computer.clone());
+        ncurses::mvprintw(
+            0,
+            0,
+            &format!(
+                "willx: {:0>2} paddlex: {:0>2} score: {:0>7}",
+                np, paddlex, score
+            ),
+        );
+        let joystick = match np.cmp(&paddlex) {
+            Ordering::Less => -1,
+            Ordering::Equal => 0,
+            Ordering::Greater => 1,
         };
         computer.push_input_and_step(joystick);
+        ncurses::refresh();
     }
+    ncurses::endwin();
+    println!("score: {}", score);
+    Ok(())
+}
+
+fn next_pos(computer: &mut intcode::Computer) -> isize {
+    while !computer.halted {
+        if let Some(output) = computer.run_until_input() {
+            for c in output.chunks(3) {
+                if let &[x, y, value] = c {
+                    if x == -1 && y == 0 {
+                        // skip score
+                    } else if Tile::from(value) == Tile::Ball && y == 23 {
+                        return x;
+                    }
+                }
+            }
+        }
+        computer.push_input_and_step(0);
+    }
+    0
 }
 
 #[derive(Eq, PartialEq)]
diff --git a/src/intcode.rs b/src/intcode.rs
index 1236bf0..654d369 100644
--- a/src/intcode.rs
+++ b/src/intcode.rs
@@ -131,7 +131,7 @@ pub struct Computer {
     modes: Modes,
     inputs: VecDeque<isize>,
     outputs: VecDeque<isize>,
-    halted: bool,
+    pub halted: bool,
 }
 
 impl Clone for Computer {
@@ -183,7 +183,6 @@ impl Computer {
 
     pub fn push_input_and_step(&mut self, input: isize) {
         self.inputs.push_back(input);
-        self.halted = false;
         self.step()
     }
 
@@ -250,7 +249,7 @@ impl Computer {
     }
 
     fn step_until_input(&mut self) {
-        loop {
+        while !self.halted {
             let instruction = self.program[self.pos];
             let instruction = ModedOpcode::from(instruction);
             self.modes = Modes::from(&instruction);
@@ -270,7 +269,7 @@ impl Computer {
         }
     }
 
-    fn step(&mut self) {
+    pub fn step(&mut self) {
         let instruction = self.program[self.pos];
         let instruction = ModedOpcode::from(instruction);
         self.modes = Modes::from(&instruction);