diff --git a/NXTInvaders.nxc b/NXTInvaders.nxc
index b038c41..ca69a36 100644
--- a/NXTInvaders.nxc
+++ b/NXTInvaders.nxc
@@ -1,449 +1,450 @@
-/*------------------------------------------------------------------------------
-; File :          NXTInvaders.nxc
-; Description :   A Space Invaders clone for the Mindstorms NXT.
-; Programmed by : Miguel Angel Astor, sonofgrendel@gmail.com
-; Version:        1.0
-; Date:           8/13/2013
-;-----------------------------------------------------------------------------*/
-
-#download "ship.ric"
-#download "splash.ric"
-#download "invader.ric"
-#download "victory.ric"
-#download "defeat.ric"
-#define X_MAX 99
-#define Y_MAX 63
-#define X_MID (X_MAX + 1) / 2
-#define Y_MID (Y_MAX + 1) / 2
-#define DRAW_PARAMS DRAW_OPT_NORMAL | DRAW_OPT_LOGICAL_XOR | DRAW_OPT_FILL_SHAPE
-#define ALIEN_WIDTH 11
-#define BASE_ALIEN_X 2
-#define BASE_ALIEN_Y 32
-#define ALIENS 6
-
-/*******************
- * Data structures *
- *******************/
-struct PLAYER_T{
-  int x;
-  int lives;
-  int score;
-};
-
-struct BULLET_T{
-  int x, y;
-  bool alive;
-};
-
-struct ALIEN_T{
-  int x, y;
-  bool alive;
-};
-
-/****************
- * Global data. *
- ****************/
-const int alien_update_speed[] = {50, 72, 95,
-                                  118, 140, 163,
-                                  186, 209, 231,
-                                  254, 277, 300 };
-int dead_aliens;
-bool victory;
-// keys[0] -> Left button; keys[1] -> Right button; keys[2] -> Center button.
-bool keys[3];
-// State: 0 -> Splash screen; 1 -> Game; 2 -> Hall of fame screen.
-int state, alien_frame, alien_x_offset;
-bool alien_x_forward, done;
-long then, then2;
-PLAYER_T player;
-BULLET_T p_bullets[3];
-ALIEN_T aliens1[ALIENS];
-ALIEN_T aliens2[ALIENS];
-BULLET_T a_bullets1[ALIENS];
-BULLET_T a_bullets2[ALIENS];
-
-/*******************
- * Game functions. *
- *******************/
- /**
-  * Catch the 3 possible player inputs.
-  */
-void input(){
-  if(ButtonPressed(BTNLEFT, false)){
-    keys[0] = true;
-  }else{
-    keys[0] = false;
-  }
-
-  if(ButtonPressed(BTNRIGHT, false)){
-    keys[1] = true;
-  }else{
-    keys[1] = false;
-  }
-
-  if(ButtonPressed(BTNCENTER, false)){
-    keys[2] = true;
-  }else{
-    keys[2] = false;
-  }
-}
-
-/**
- * Processes player input, moves game objects and updates the game's state.
- */
-void update(){
-  long now, delta_t, fire;
-  
-  if(state == 0){
-    if(keys[2]){
-      state = 1;
-    }
-  }else if(state == 1){
-    // Move the player.
-    if(keys[0]){
-      if(player.x - 1 >= 3){
-        player.x -= 1;
-      }
-    }
-    if(keys[1]){
-      if(player.x + 1 <= X_MAX - 4){
-        player.x += 1;
-      }
-    }
-
-    // If the center button was pressed, fire a bullet.
-    if(keys[2]){
-      now = CurrentTick();
-      delta_t = now - then;
-      if(delta_t >= 500){
-        // One bullet every 500 miliseconds.
-        for(int i = 0; i < 3; i++){
-          if(!p_bullets[i].alive){
-            p_bullets[i].x = player.x;
-            p_bullets[i].y = 0;
-            p_bullets[i].alive = true;
-            PlayTone(262, 100);
-            break;
-          }
-        }
-        then = now;
-      }
-    }
-
-    // Update the player's bullets.
-    for(int i = 0; i < 3; i++){
-      if(p_bullets[i].alive){
-        p_bullets[i].y += 1;
-        if(p_bullets[i].y >= Y_MAX + 2){
-          p_bullets[i].alive = false;
-        }
-      }
-    }
-
-    // Update the aliens.
-    now = CurrentTick();
-    delta_t = now - then2;
-    if(delta_t >= alien_update_speed[11 - dead_aliens]){
-      // Change the frame.
-      if(alien_frame == 0){
-        alien_frame = 11;
-      }else{
-        alien_frame = 0;
-      }
-      
-      // Move in the correct direction.
-      if(alien_x_forward){
-        alien_x_offset += 1;
-        if(alien_x_offset >= 15){
-          // Change direction 2 pixels before the edge of the screen.
-          alien_x_offset -= 1;
-          alien_x_forward = false;
-        }
-      }else{
-        alien_x_offset -= 1;
-        if(alien_x_offset <= 0){
-          // Change direction 2 pixels before the edge of the screen.
-          alien_x_offset += 1;
-          alien_x_forward = true;
-        }
-      }
-    
-      // Fire on the player.
-      for(int i = 0; i < ALIENS; i++){
-        // First row.
-        if(aliens1[i].alive && !a_bullets1[i].alive){
-          fire = rand() % 100;
-          if(fire < 25){
-            // 0.25 probability of firing.
-            a_bullets1[i].alive = true;
-            a_bullets1[i].x = aliens1[i].x + alien_x_offset + 5;
-            a_bullets1[i].y = aliens1[i].y;
-            PlayTone(400, 100);
-          }
-        }
-        // Second row.
-        if(aliens2[i].alive && !a_bullets2[i].alive){
-          fire = rand() % 100;
-          if(fire > 75){
-            // 0.25 probability of firing.
-            a_bullets2[i].alive = true;
-            a_bullets2[i].x = aliens2[i].x + alien_x_offset + 5;
-            a_bullets2[i].y = aliens2[i].y;
-            PlayTone(400, 100);
-          }
-        }
-      }
-      then2 = now;
-    }
-
-    // Update the alien's bullets.
-    for(int i = 0; i < ALIENS; i++){
-      // First row.      
-      if(a_bullets1[i].alive){
-        a_bullets1[i].y -= 1;
-        if(a_bullets1[i].y < -2){
-          a_bullets1[i].alive = false;
-        }
-      }
-      // Second row.
-      if(a_bullets2[i].alive){
-        a_bullets2[i].y -= 1;
-        if(a_bullets2[i].y < -2){
-          a_bullets2[i].alive = false;
-        }
-      }
-    }
-
-    // Check if any bullet shot by the player hit an alien.
-    for(int i = 0; i < 3; i++){
-      if(p_bullets[i].alive){
-        if(p_bullets[i].y >= 22 && p_bullets[i].y <= 30){
-          // Check the second row first.
-          for(int j = 0; j < ALIENS; j++){
-            if(aliens2[j].alive){
-              if(p_bullets[i].x >= aliens2[j].x + alien_x_offset &&
-                 p_bullets[i].x <= aliens2[j].x + alien_x_offset + 11){
-                aliens2[j].alive = false;
-                p_bullets[i].alive = false;
-                player.score += 100;
-                dead_aliens += 1;
-                PlayTone(100, 250);
-                break;
-              }
-            }
-          }
-        }else if(p_bullets[i].y >= 32 && p_bullets[i].y <= 40){
-          // Check the first row last.
-          for(int j = 0; j < ALIENS; j++){
-            if(aliens1[j].alive){
-              if(p_bullets[i].x >= aliens1[j].x + alien_x_offset &&
-                 p_bullets[i].x <= aliens1[j].x + alien_x_offset + 11){
-                aliens1[j].alive = false;
-                p_bullets[i].alive = false;
-                player.score += 150;
-                dead_aliens += 1;
-                PlayTone(100, 250);
-                break;
-              }
-            }
-          }
-        }
-      }
-    }
-
-    // Check alien bullet collisions with player.
-    // First row.
-    for(int i = 0; i < ALIENS; i++){
-      if(a_bullets1[i].alive && a_bullets1[i].y <= 2){
-        if(a_bullets1[i].x >= player.x - 3 && a_bullets1[i].x <= player.x + 4){
-          // If the bullet hit the player, reset the game.
-          player.x = X_MID;
-          player.lives -= 1;
-          alien_x_offset = 0;
-          alien_x_forward = true;
-          for(int j = 0; j < ALIENS; j++){
-            a_bullets1[i].alive = false;
-            a_bullets2[i].alive = false;
-          }
-          PlayTone(100, 250);
-          break;
-        }
-      }
-    }
-    
-    // Second row
-    for(int i = 0; i < ALIENS; i++){
-      if(a_bullets2[i].alive && a_bullets2[i].y <= 2){
-        if(a_bullets2[i].x >= player.x - 3 && a_bullets2[i].x <= player.x + 4){
-          // If the bullet hit the player, reset the game.
-          player.x = X_MID;
-          player.lives -= 1;
-          alien_x_offset = 0;
-          alien_x_forward = true;
-          for(int j = 0; j < ALIENS; j++){
-            a_bullets1[i].alive = false;
-            a_bullets2[i].alive = false;
-          }
-          PlayTone(100, 250);
-          break;
-        }
-      }
-    }
-
-    // Check victory/defeat conditions.
-    if(dead_aliens == 12){
-      state = 2;
-      victory = true;
-      PlayTone(500, 1000);
-      ClearScreen();
-    }else if(player.lives < 0){
-      state = 2;
-      victory = false;
-      PlayTone(100, 1000);
-      ClearScreen();
-    }
-  }else{
-    if(keys[2]){
-      done = true;
-    }
-  }
-}
-
-/**
- * Draws all game objects to the LCD screen of the robot.
- */
-void render(){
-  int params[3] = {0, 0, 0};
-  if(state == 0){
-    // Render the splash screen.
-    GraphicOut(0, 0, "splash.ric");
-  }else if(state == 1){
-    ClearScreen();
-    // Render informative text.
-    TextOut(0, LCD_LINE1, "LIVES:");
-    //NumOut(35, LCD_LINE1, player.lives);
-    params[0] = 35;
-    GraphicOutEx(0, LCD_LINE1 + 1, "ship.ric", params);
-    if(player.lives > 1){
-      params[0] = 44;
-      GraphicOutEx(0, LCD_LINE1 + 1, "ship.ric", params);
-      if(player.lives > 2){
-        params[0] = 53;
-        GraphicOutEx(0, LCD_LINE1 + 1, "ship.ric", params);
-      }
-    }
-    TextOut(0, LCD_LINE2, "SCORE:");
-    NumOut(35, LCD_LINE2, player.score);
-
-    // Render the player's sprite.
-    params[0] = player.x - 3;
-    GraphicOutEx(0, 0, "ship.ric", params);
-
-    // Render the player's bullets.
-    for(int i = 0; i < 3; i++){
-      if(p_bullets[i].alive){
-        RectOut(p_bullets[i].x, p_bullets[i].y, 0, 2, DRAW_PARAMS);
-      }
-    }
-
-    // Render the aliens.
-    for(int i = 0; i < ALIENS; i++){
-      if(aliens1[i].alive){
-        // First row.
-        params[0] = alien_frame;
-        params[1] = aliens1[i].x + alien_x_offset;
-        params[2] = aliens1[i].y;
-        GraphicOutEx(0, 0, "invader.ric", params);
-      }
-      if(aliens2[i].alive){
-        // Second row.
-        params[0] = alien_frame;
-        params[1] = aliens2[i].x + alien_x_offset;
-        params[2] = aliens2[i].y;
-        GraphicOutEx(0, 0, "invader.ric", params);
-      }
-    }
-
-    // Render the aliens's bullets.
-    for(int i = 0; i < ALIENS; i++){
-      if(a_bullets1[i].alive){
-        RectOut(a_bullets1[i].x, a_bullets1[i].y, 0, 2, DRAW_PARAMS);
-      }
-      if(a_bullets2[i].alive){
-        RectOut(a_bullets2[i].x, a_bullets2[i].y, 0, 2, DRAW_PARAMS);
-      }
-    }
-  }else{
-    // Render the hall of fame.
-    if(victory){
-      params[0] = player.score;
-      GraphicOutEx(0, 0, "victory.ric", params);
-    }else{
-      GraphicOut(0, 0, "defeat.ric");
-    }
-  }
-}
-
-/**
- * The heart of the game.
- */
-void game_loop(){
-  while(!done){
-    input();
-    update();
-    render();
-    Wait(50);
-  }
-}
-
-/**
- * Initializes all game data and call the game loop.
- */
-task main(){
-  // Initialize game data.
-  state = 0;
-  done = false;
-  alien_frame = 0;
-  alien_x_offset = 0;
-  alien_x_forward = true;
-
-  // Initialize the player and bullets.
-  player.x = X_MID;
-  player.lives = 3;
-  player.score = 0;
-
-  for(int i = 0; i < 3; i++){
-    p_bullets[i].x = 0;
-    p_bullets[i].y = 0;
-    p_bullets[i].alive = false;
-  }
-
-  // Initialize the aliens.
-  dead_aliens = 0;
-  for(int i = 0; i < ALIENS; i++){
-    // First row.
-    aliens1[i].x = BASE_ALIEN_X + (i * 14);
-    aliens1[i].y = BASE_ALIEN_Y;
-    aliens1[i].alive = true;
-    // Second row.
-    aliens2[i].x = BASE_ALIEN_X + (i * 14);
-    aliens2[i].y = BASE_ALIEN_Y - 10;
-    aliens2[i].alive = true;
-    // Alien bullets, first row.
-    a_bullets1[i].x = 0;
-    a_bullets1[i].y = 0;
-    a_bullets1[i].alive = false;
-    // Second row.
-    a_bullets2[i].x = 0;
-    a_bullets2[i].y = 0;
-    a_bullets2[i].alive = false;
-  }
-
-  // Initialize time variables.
-  then = CurrentTick();
-  then2 = CurrentTick();
-
-  // Start the game!
-  PlayTone(500, 1000);
-  game_loop();
-}
+/*------------------------------------------------------------------------------
+; File :          NXTInvaders.nxc
+; Description :   A Space Invaders clone for the Mindstorms NXT.
+; Programmed by : Miguel Angel Astor, sonofgrendel@gmail.com
+; Version:        1.0
+; Date:           8/13/2013
+;-----------------------------------------------------------------------------*/
+
+#download "ship.ric"
+#download "splash.ric"
+#download "invader.ric"
+#download "victory.ric"
+#download "defeat.ric"
+#define X_MAX 99
+#define Y_MAX 63
+#define X_MID (X_MAX + 1) / 2
+#define Y_MID (Y_MAX + 1) / 2
+#define DRAW_PARAMS DRAW_OPT_NORMAL | DRAW_OPT_LOGICAL_XOR | DRAW_OPT_FILL_SHAPE
+#define ALIEN_WIDTH 11
+#define BASE_ALIEN_X 2
+#define BASE_ALIEN_Y 32
+#define ALIENS 6
+
+/*******************
+ * Data structures *
+ *******************/
+struct PLAYER_T{
+  int x;
+  int lives;
+  int score;
+};
+
+struct BULLET_T{
+  int x, y;
+  bool alive;
+};
+
+struct ALIEN_T{
+  int x, y;
+  bool alive;
+};
+
+/****************
+ * Global data. *
+ ****************/
+const int alien_update_speed[] = {50, 72, 95,
+                                  118, 140, 163,
+                                  186, 209, 231,
+                                  254, 277, 300 };
+int dead_aliens;
+bool victory;
+// keys[0] -> Left button; keys[1] -> Right button; keys[2] -> Center button.
+bool keys[3];
+// State: 0 -> Splash screen; 1 -> Game; 2 -> Hall of fame screen.
+int state, alien_frame, alien_x_offset;
+bool alien_x_forward, done;
+long then, then2;
+PLAYER_T player;
+BULLET_T p_bullets[3];
+ALIEN_T aliens1[ALIENS];
+ALIEN_T aliens2[ALIENS];
+BULLET_T a_bullets1[ALIENS];
+BULLET_T a_bullets2[ALIENS];
+
+/*******************
+ * Game functions. *
+ *******************/
+ /**
+  * Catch the 3 possible player inputs.
+  */
+void input(){
+  if(ButtonPressed(BTNLEFT, false)){
+    keys[0] = true;
+  }else{
+    keys[0] = false;
+  }
+
+  if(ButtonPressed(BTNRIGHT, false)){
+    keys[1] = true;
+  }else{
+    keys[1] = false;
+  }
+
+  if(ButtonPressed(BTNCENTER, false)){
+    keys[2] = true;
+  }else{
+    keys[2] = false;
+  }
+}
+
+/**
+ * Processes player input, moves game objects and updates the game's state.
+ */
+void update(){
+  long now, delta_t, fire;
+  
+  if(state == 0){
+    if(keys[2]){
+      state = 1;
+    }
+  }else if(state == 1){
+    // Move the player.
+    if(keys[0]){
+      if(player.x - 1 >= 3){
+        player.x -= 1;
+      }
+    }
+    if(keys[1]){
+      if(player.x + 1 <= X_MAX - 4){
+        player.x += 1;
+      }
+    }
+
+    // If the center button was pressed, fire a bullet.
+    if(keys[2]){
+      now = CurrentTick();
+      delta_t = now - then;
+      if(delta_t >= 500){
+        // One bullet every 500 miliseconds.
+        for(int i = 0; i < 3; i++){
+          if(!p_bullets[i].alive){
+            p_bullets[i].x = player.x;
+            p_bullets[i].y = 0;
+            p_bullets[i].alive = true;
+            PlayTone(262, 100);
+            break;
+          }
+        }
+        then = now;
+      }
+    }
+
+    // Update the player's bullets.
+    for(int i = 0; i < 3; i++){
+      if(p_bullets[i].alive){
+        p_bullets[i].y += 1;
+        if(p_bullets[i].y >= Y_MAX + 2){
+          p_bullets[i].alive = false;
+        }
+      }
+    }
+
+    // Update the aliens.
+    now = CurrentTick();
+    delta_t = now - then2;
+    if(delta_t >= alien_update_speed[11 - dead_aliens]){
+      // Change the frame.
+      if(alien_frame == 0){
+        alien_frame = 11;
+      }else{
+        alien_frame = 0;
+      }
+      
+      // Move in the correct direction.
+      if(alien_x_forward){
+        alien_x_offset += 1;
+        if(alien_x_offset >= 15){
+          // Change direction 2 pixels before the edge of the screen.
+          alien_x_offset -= 1;
+          alien_x_forward = false;
+        }
+      }else{
+        alien_x_offset -= 1;
+        if(alien_x_offset <= 0){
+          // Change direction 2 pixels before the edge of the screen.
+          alien_x_offset += 1;
+          alien_x_forward = true;
+        }
+      }
+    
+      // Fire on the player.
+      for(int i = 0; i < ALIENS; i++){
+        // First row.
+        if(aliens1[i].alive && !a_bullets1[i].alive){
+          fire = rand() % 100;
+          if(fire < 25){
+            // 0.25 probability of firing.
+            a_bullets1[i].alive = true;
+            a_bullets1[i].x = aliens1[i].x + alien_x_offset + 5;
+            a_bullets1[i].y = aliens1[i].y;
+            PlayTone(400, 100);
+          }
+        }
+        // Second row.
+        if(aliens2[i].alive && !a_bullets2[i].alive){
+          fire = rand() % 100;
+          if(fire > 75){
+            // 0.25 probability of firing.
+            a_bullets2[i].alive = true;
+            a_bullets2[i].x = aliens2[i].x + alien_x_offset + 5;
+            a_bullets2[i].y = aliens2[i].y;
+            PlayTone(400, 100);
+          }
+        }
+      }
+      then2 = now;
+    }
+
+    // Update the alien's bullets.
+    for(int i = 0; i < ALIENS; i++){
+      // First row.      
+      if(a_bullets1[i].alive){
+        a_bullets1[i].y -= 1;
+        if(a_bullets1[i].y < -2){
+          a_bullets1[i].alive = false;
+        }
+      }
+      // Second row.
+      if(a_bullets2[i].alive){
+        a_bullets2[i].y -= 1;
+        if(a_bullets2[i].y < -2){
+          a_bullets2[i].alive = false;
+        }
+      }
+    }
+
+    // Check if any bullet shot by the player hit an alien.
+    for(int i = 0; i < 3; i++){
+      if(p_bullets[i].alive){
+        if(p_bullets[i].y >= 22 && p_bullets[i].y <= 30){
+          // Check the second row first.
+          for(int j = 0; j < ALIENS; j++){
+            if(aliens2[j].alive){
+              if(p_bullets[i].x >= aliens2[j].x + alien_x_offset &&
+                 p_bullets[i].x <= aliens2[j].x + alien_x_offset + 11){
+                aliens2[j].alive = false;
+                p_bullets[i].alive = false;
+                player.score += 100;
+                dead_aliens += 1;
+                PlayTone(100, 250);
+                break;
+              }
+            }
+          }
+        }else if(p_bullets[i].y >= 32 && p_bullets[i].y <= 40){
+          // Check the first row last.
+          for(int j = 0; j < ALIENS; j++){
+            if(aliens1[j].alive){
+              if(p_bullets[i].x >= aliens1[j].x + alien_x_offset &&
+                 p_bullets[i].x <= aliens1[j].x + alien_x_offset + 11){
+                aliens1[j].alive = false;
+                p_bullets[i].alive = false;
+                player.score += 150;
+                dead_aliens += 1;
+                PlayTone(100, 250);
+                break;
+              }
+            }
+          }
+        }
+      }
+    }
+
+    // Check alien bullet collisions with player.
+    // First row.
+    for(int i = 0; i < ALIENS; i++){
+      if(a_bullets1[i].alive && a_bullets1[i].y <= 2){
+        if(a_bullets1[i].x >= player.x - 3 && a_bullets1[i].x <= player.x + 4){
+          // If the bullet hit the player, reset the game.
+          player.x = X_MID;
+          player.lives -= 1;
+          alien_x_offset = 0;
+          alien_x_forward = true;
+          for(int j = 0; j < ALIENS; j++){
+            a_bullets1[i].alive = false;
+            a_bullets2[i].alive = false;
+          }
+          PlayTone(100, 250);
+          break;
+        }
+      }
+    }
+    
+    // Second row
+    for(int i = 0; i < ALIENS; i++){
+      if(a_bullets2[i].alive && a_bullets2[i].y <= 2){
+        if(a_bullets2[i].x >= player.x - 3 && a_bullets2[i].x <= player.x + 4){
+          // If the bullet hit the player, reset the game.
+          player.x = X_MID;
+          player.lives -= 1;
+          alien_x_offset = 0;
+          alien_x_forward = true;
+          for(int j = 0; j < ALIENS; j++){
+            a_bullets1[i].alive = false;
+            a_bullets2[i].alive = false;
+          }
+          PlayTone(100, 250);
+          break;
+        }
+      }
+    }
+
+    // Check victory/defeat conditions.
+    if(dead_aliens == 12){
+      state = 2;
+      victory = true;
+      PlayTone(500, 1000);
+      ClearScreen();
+    }else if(player.lives < 0){
+      state = 2;
+      victory = false;
+      PlayTone(100, 1000);
+      ClearScreen();
+    }
+  }else{
+    if(keys[2]){
+      done = true;
+    }
+  }
+}
+
+/**
+ * Draws all game objects to the LCD screen of the robot.
+ */
+void render(){
+  int params[3] = {0, 0, 0};
+  if(state == 0){
+    // Render the splash screen.
+    GraphicOut(0, 0, "splash.ric");
+  }else if(state == 1){
+    ClearScreen();
+    // Render informative text.
+    TextOut(0, LCD_LINE1, "LIVES:");
+    params[0] = 35;
+    if(player.lives > 0){
+      GraphicOutEx(0, LCD_LINE1 + 1, "ship.ric", params);
+      if(player.lives > 1){
+        params[0] = 44;
+        GraphicOutEx(0, LCD_LINE1 + 1, "ship.ric", params);
+        if(player.lives > 2){
+          params[0] = 53;
+          GraphicOutEx(0, LCD_LINE1 + 1, "ship.ric", params);
+        }
+      }
+    }
+    TextOut(0, LCD_LINE2, "SCORE:");
+    NumOut(35, LCD_LINE2, player.score);
+
+    // Render the player's sprite.
+    params[0] = player.x - 3;
+    GraphicOutEx(0, 0, "ship.ric", params);
+
+    // Render the player's bullets.
+    for(int i = 0; i < 3; i++){
+      if(p_bullets[i].alive){
+        RectOut(p_bullets[i].x, p_bullets[i].y, 0, 2, DRAW_PARAMS);
+      }
+    }
+
+    // Render the aliens.
+    for(int i = 0; i < ALIENS; i++){
+      if(aliens1[i].alive){
+        // First row.
+        params[0] = alien_frame;
+        params[1] = aliens1[i].x + alien_x_offset;
+        params[2] = aliens1[i].y;
+        GraphicOutEx(0, 0, "invader.ric", params);
+      }
+      if(aliens2[i].alive){
+        // Second row.
+        params[0] = alien_frame;
+        params[1] = aliens2[i].x + alien_x_offset;
+        params[2] = aliens2[i].y;
+        GraphicOutEx(0, 0, "invader.ric", params);
+      }
+    }
+
+    // Render the aliens's bullets.
+    for(int i = 0; i < ALIENS; i++){
+      if(a_bullets1[i].alive){
+        RectOut(a_bullets1[i].x, a_bullets1[i].y, 0, 2, DRAW_PARAMS);
+      }
+      if(a_bullets2[i].alive){
+        RectOut(a_bullets2[i].x, a_bullets2[i].y, 0, 2, DRAW_PARAMS);
+      }
+    }
+  }else{
+    // Render the hall of fame.
+    if(victory){
+      params[0] = player.score;
+      GraphicOutEx(0, 0, "victory.ric", params);
+    }else{
+      GraphicOut(0, 0, "defeat.ric");
+    }
+  }
+}
+
+/**
+ * The heart of the game.
+ */
+void game_loop(){
+  while(!done){
+    input();
+    update();
+    render();
+    Wait(50);
+  }
+}
+
+/**
+ * Initializes all game data and call the game loop.
+ */
+task main(){
+  // Initialize game data.
+  state = 0;
+  done = false;
+  alien_frame = 0;
+  alien_x_offset = 0;
+  alien_x_forward = true;
+
+  // Initialize the player and bullets.
+  player.x = X_MID;
+  player.lives = 3;
+  player.score = 0;
+
+  for(int i = 0; i < 3; i++){
+    p_bullets[i].x = 0;
+    p_bullets[i].y = 0;
+    p_bullets[i].alive = false;
+  }
+
+  // Initialize the aliens.
+  dead_aliens = 0;
+  for(int i = 0; i < ALIENS; i++){
+    // First row.
+    aliens1[i].x = BASE_ALIEN_X + (i * 14);
+    aliens1[i].y = BASE_ALIEN_Y;
+    aliens1[i].alive = true;
+    // Second row.
+    aliens2[i].x = BASE_ALIEN_X + (i * 14);
+    aliens2[i].y = BASE_ALIEN_Y - 10;
+    aliens2[i].alive = true;
+    // Alien bullets, first row.
+    a_bullets1[i].x = 0;
+    a_bullets1[i].y = 0;
+    a_bullets1[i].alive = false;
+    // Second row.
+    a_bullets2[i].x = 0;
+    a_bullets2[i].y = 0;
+    a_bullets2[i].alive = false;
+  }
+
+  // Initialize time variables.
+  then = CurrentTick();
+  then2 = CurrentTick();
+
+  // Start the game!
+  PlayTone(500, 1000);
+  game_loop();
+}
\ No newline at end of file