I didn't!  I just use 8x8 sprites like normal.  For instance the sprite for the character is technically 8x8, but the only pixels in the sprite that are black are in the top-left 5x5 region.  When you display it with a Pt-On() command, you can't even tell the difference

As long as you use Pt-On or Pt-Change, the extra white around your 5x5 tile won't interfere with any of your graphics, and will be just the same as if you had a 5x5 sprite routine.  If you end up needing Pt-Off, you have to get a little more creative with masking.

No, box physics was never planned in that way.  It just causes too many problems due to the fact that boxes can go through portals.  Not only would I have to build something like Zedd, but it would also have to work through portals

I see. woulda been cool though

A friend of mine gave me this link this morning, knowing I like calculator programming. She thought I might be interested
http://www.buzzfeed.com/thesaccattack/you-can-now-play-portal-on-a-graphing-calculator-5o2x

I then proceeded to show off Portal and got a few friends quite engaged in the game

Hahaha lol i just tried it and it's true
So maybe this was for level testing and he forgot to change it...?

Ooooh ok, cool :p
It's a pretty neat thingy are tere any other cool stuff?

it loads a self-created map from the map editor