Basically, this is a remake of the game 'Portal' by Valve. It is a good remake, though in 2D. This game works with any shell that supports basic, but I found one thing that is annoying. Whenever you save, every file that it saves to (quite a few, but not enough to make a huge difference in your RAM), isn't archived. This may not seem bad, and it isn't, but my calculator has some minor problems with save files taking up almost every variable within the RAM.

As for the positives; this is a very good remake of Portal in 2D. There really isn't much to say, other than this is an amazing game for BASIC. It still feels original, and it sometimes feels like ASM.

As a final note, I'd like to say that I own an 84+ SE, and I'm not sure how this program runs speed-wise on an 83+.

Speed: 8- Pretty good. Almost ASM-like, except for lasers.

Controls: 8.5- A little confusing at first, but actually very practical and easy.

Gameplay: 7- A slightly watered-down version of Portal.

Graphics: 8- Simple, but very effective.

Size: 7- Large, and saves don't archive. However, easter eggs make up for this.