I have been tinkering with Zep's "Wall Collision Example", but I can't seem to get it to work. How can I make boundaries/walls (represented by the four pixels arranged in a square)?

UPDATE: If you are brand spankin' new to PICO-8 and need a tutorial to build walls and boundaries around your map, I highly recommend Uncle Matt on Youtube. ;-) Start here.

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Cart #45064 | 2017-10-10 | Code ▽ | Embed ▽ | License: CC4-BY-NC-SA

Have a look at the collide demo code (bundled with pico-8). It has everything (and more) to work with maps in a solid way.

Use sprite flags to identify logical elements (1=wall, 2=flower, 3=nest...)