Normally what I do is a bunch of ‘if player x position < 0 then player xspeed = - player xspeed
If player x > screenwidth then player xspeed = - player xspeed
If player y position < 0 then player y speed = - player y speed
If player y position > screen height then player y speed = - player y speed.’

This has the effect of bouncing you off walls. To stop dead, you’d put speed = 0, and laso probably shift the players position a bit to put them back jnside the screen if they go over by a few pixels.

There’s a clever example in the tutorials using clamp() which looks neater. It’s at https://fuzearena.com/help/view/Sprite Game - scroll down to the part ‘creating boundaries’

You can also use maps, probably, and use the map collision. All sorts of ways to skin a cat. Hope this helps!

That worked thank you! One problem I was having is that I didn't set the sprite to "player" but instead "elf".