Coin

You probably know what to do by now. Like before, we'll start by creating the Actor for the coin.

coin = Actor('coingold')

We'll also need to draw in in the draw() function.

coin.draw()

Random position

We want our coin to start in a random position. To do that, we'll need the help of the random module. Let's start by importing this module.

import random

This line should be placed at the top, just below import pgzrun.

Since the width of our screen is 800, we want our coin to start with an x position that is somewhere between 0 to 800.

coin.x = random.randint(0, 800)

And since the height of our screen is 600, we want our coin to start with an y position that is somewhere between 0 to 600.

coin.y = random.randint(0, 600)

At this point...

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

import pgzrun
import random

WIDTH = 800
HEIGHT = 600

background = Actor('grass')

player = Actor('p3_front')
player.x = 400
player.y = 300

coin = Actor('coingold')
coin.x = random.randint(0, 800)
coin.y = random.randint(0, 600)

def update():
    if keyboard.up:
        player.y -= 5
    if keyboard.down:
        player.y += 5
    if keyboard.left:
        player.x -= 5
    if keyboard.right:
        player.x += 5

def draw():
    background.draw()
    player.draw()
    coin.draw()

pgzrun.go() # Must be last line

Your game should now look like this...

Since the coin position is randomized, your coin may not appear in the same position as mine. Try closing and restarting the game a few times; you should see the coin appear in a different position each time.