diff --git a/as3/as3.cpp b/as3/as3.cpp
index 725c8c6..fa52395 100644
--- a/as3/as3.cpp
+++ b/as3/as3.cpp
@@ -6,6 +6,7 @@
 #include "Model.hpp"
 #include "raylib.h"
 #include <raylib-cpp.hpp>
+#include <cmath>
 #include <iostream>
 
 #define SKYBOX_IMPLEMENTATION
@@ -44,7 +45,6 @@ int main() {
     raylib::AudioDevice audio;
 
     raylib::Model penguin("models/penguin.glb");
-    raylib::Model eagle("models/eagle.glb");
 
     raylib::Camera3D camera(
         { 0, 120, 500 },
@@ -56,35 +56,68 @@ int main() {
     cs381::SkyBox skybox("textures/skybox.png");
 
     raylib::Vector3 position = { 0, 0, 0 };
-    raylib::Vector3 velocity = { 5, 0, 0 };
+    raylib::Vector3 velocity = { 0, 0, 0 };
+    float heading = 0.0f;
+    float speed = 0.0f;
+
+    // units/s
+    const float ACCELERATION = 100.0f;
+
+    // in radians
+    const float ANGULAR_VELOCITY = 3.14f;
 
     window.SetTargetFPS(60); // save cpu cycles
 
     while (!window.ShouldClose()) {
         window.BeginDrawing();
-
         window.ClearBackground(raylib::Color::Gray());
 
         float dt = window.GetFrameTime();
-        position += velocity * dt;
+
+        position += velocity * dt * 0.5f;
+
+        if (IsKeyDown(KEY_W)) {
+            speed += ACCELERATION * dt;
+        }
+
+        if (IsKeyDown(KEY_S)) {
+            speed -= ACCELERATION * dt;
+        }
+
+        if (IsKeyDown(KEY_A)) {
+            heading += ANGULAR_VELOCITY * dt;
+        }
+
+        if (IsKeyDown(KEY_D)) {
+            heading -= ANGULAR_VELOCITY * dt;
+        }
+
+        if (IsKeyDown(KEY_SPACE)) {
+            speed = 0.0f;
+        }
+
+        velocity = raylib::Vector3 {
+            std::sin(heading) * speed,
+            0.0f,
+            std::cos(heading) * speed
+        };
+
+        // ds = 1/2 * (v0 + v1) * dt
+        position += velocity * dt * 0.5f;
 
         camera.BeginMode();
-
         skybox.Draw();
 
-        // in addition to the required transforms, the models will rotate 10
-        // degrees per second (extra credit), and the penguin is scaled by 30
-        // eagle scaled by 10
+        ground.Draw({ 0, 0, 0 }, 1.0f, raylib::Color::White());
 
-        // Draw one eagle located at (0, 0, 0), default scale, and with default
-        // orientation (10 points).
-        DrawBoundedModel(penguin, [&position](raylib::Matrix transform) {
+        DrawBoundedModel(penguin, [&position, &heading](raylib::Matrix transform) {
             return transform
+                .RotateY(heading)
+                .Scale(40, 40, 40)
                 .Translate(position);
         });
 
         camera.EndMode();
-
         window.EndDrawing();
     }