Maze Game Tutorial 8
Enemies
Create Sprites for Enemies
Our game might be fun as it is, but adding enemies will make a more challenging and
entertaining experience. Let’s create some sprites for our monsters.
 Click on Sprites and then Create Sprite.
 Name the sprite spr_enemyHorizontal.
 Click Load Sprite and select monster1.png.
 Make sure Precise Collision Checking is not selected.
 Click OK.
 Create another sprite, but call this one spr_enemyVertical.
 Load Sprite and select monster3.png
 Make sure Precise Collision Checking is not selected.
 Click OK.
Create Object for Horizontal Enemies
We’re going to have different types of enemies behave differently. Let’s start with the
enemies that move horizontally.
 Click on Objects and then Create Object.
 Name it obj_enemyHorizontal and select spr_enemyHorizontal for its
sprite.
 Click on Add Event.
 Click on Create.
 Click on the control tab.
 Under variables, drag out the Set Variables icon.
 Name the variable speed.
 Set the value to be something less that the player’s speed (e.g. 3).
 Click OK.
 Click on Add Event
 Click on Step.
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 Click on the move tab.
 Drag the Move Fixed icon to the Actions window.
 Select either right or left direction.
 Write speed in the space for Speed.
 Click OK.
Make Horizontal Enemies Bounce Off Walls
Currently our horizontal enemies aren’t very interesting. When they reach a wall they
get stuck. Let’s make it so they turn around when they get to a wall.
 Click on Add Event.
 Click on Collision.
 Select obj_wall
 Select the control tab.
 Drag the Set Variable icon to the Actions window.
 Write Speed in the variable space.
 Write “speed* -1” in the value space. This makes the enemy change direction
when it hits wall.
 Click OK.
Make Enemies Kill the Player
We have to give the players a reason to not bump into the enemies. So, let’s kill the
player if they touch an enemy.
 Select obj_player and add event on collision select obj_enemy.
 Click on the main2 tab.
 Drag the Display Message icon to the Actions window.
 Write, “Oh, No! You have been eaten by the ghost.” as the message.
 Click OK.
 Click on the main1 tab.
 Drag the Restart Room icon out to the Actions window.
 Add transition effect in the Transition box.
 Click OK twice.
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 Click on rm_one and put a ghost in the room.
 Run your game and test everything.
Make Vertical Moving Enemies
Now let’s make the enemies that are going to move vertically in our game. Lucky for
us, we can reuse a lot of our work.
 Click on Objects.
 Right click on obj_enemyHorizontal.
 Click on Duplicate.
 Change the name to obj_enemyVertical.
 Change the sprite to spr_enemyVertical.
 In the Events window, click on Step.
 In the Actions window, click on the Directions icon.
 Uncheck the horizontal directions and select a vertical direction (up or down).
 Click OK twice.
 Click on rm_two and add vertical moving enemies to the room.
 Run your game and test everything.
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Copyright © 2012 University of Southern California
Sponsored by the U.S. National Science Foundation
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