# Collision

In Dodge the Creep, the game ends if you touch any enemy. So to keep track of whether the game is over, we'll create a new variable...

``````game_over = False
``````

We're calling this variable game_over and we'll set it to False at the start of the game.

## List Collide

Since we have a list of enemies that we can collide against, we can use the collidelist function to check if the player is colliding with any of them.

If the player collided with an enemy, collidelist will return the index of this enemy. For example, if the player collided with the first enemy, collidelist will return the value 0.

If the player didn't collide with any of the enemies in the list, collidelist will return -1. If the return value is not -1, it means that there is a collision.

``````if player.collidelist(enemies) != -1:
game_over = True
``````

This is what the above code is saying: "If the player collided with an enemy, set game_over to True".

Don't forget to declare that game_over is a global variable.

``````global game_over
``````

## Drawing Game Over message

If the game is over, we'll clear the screen and draw the words "Game Over" for now.

``````if game_over:
screen.clear()
screen.draw.text('Game Over', (350,270), color=(255,255,255), fontsize=30)
``````

## Testing it out

If your game in written correctly, you should now get a "Game Over" message when you touch any one of the enemy. Test it out and make sure it is working correctly.

## At this point...

Right now your code should look like this (new and modified lines are highlighted in yellow)...

``````import pgzrun
import random

WIDTH = 800
HEIGHT = 600

game_over = False

background = Actor('water')

player = Actor('p1_front')
player.x = 400
player.y = 300

enemies = []

def update():
global game_over

if keyboard.up:
player.y -= 5
if keyboard.down:
player.y += 5
if keyboard.left:
player.x -= 5
if keyboard.right:
player.x += 5

if random.randint(0, 60) == 0:
side = random.randint(1, 4)
enemy = Actor('worm.png')

if side == 1:
enemy.y = random.randint(0, 600)
enemy.x = 850
enemy.angle = 0
elif side == 2:
enemy.y = random.randint(0, 600)
enemy.x = -50
enemy.angle = 180
elif side == 3:
enemy.y = 650
enemy.x = random.randint(0, 800)
enemy.angle = 270
elif side == 4:
enemy.y = -50
enemy.x = random.randint(0, 800)
enemy.angle = 90

enemies.append(enemy)

for enemy in enemies:
if enemy.angle == 0:
enemy.x -= 3
elif enemy.angle == 180:
enemy.x += 3
elif enemy.angle == 270:
enemy.y -= 3
elif enemy.angle == 90:
enemy.y += 3

if enemy.x < -50 or enemy.x > 850 or enemy.y < -50 or enemy.y > 650:
enemies.remove(enemy)

if player.collidelist(enemies) != -1:
game_over = True

def draw():
if game_over:
screen.clear()
screen.draw.text('Game Over', (350,270), color=(255,255,255), fontsize=30)
else:
background.draw()
player.draw()
for enemy in enemies:
enemy.draw()

pgzrun.go()
``````