Graphics - 9/10 - Awesome graphics for TI-BASIC, looking ASM-like
Game-play/Controls - 10/10 - Nice controls and gameplay. Pretty much perfect for pure BASIC.
Difficulty - 1/10 - The only real problem with this game is that the default levels are way too hard, hard to the point where someone with an IQ under 200 is nearly guaranteed to never be able to solve the first one. Fortunately the game lets you use other level sets, but still remains the fact that the included one is just too hard, if not impossible to solve even for experienced puzzle gamers. I spent weeks on the first default level then I gave up.
Speed - 9/10 - The game speed is pretty nice for BASIC. The only issue is that map loading is slow but it is not unbearable either.
Overall - if only the main level set was possible to use, I would give this game a 7/10 due to the extreme difficulty, but since using other level sets is possible, I give this a 9/10. A must download for puzzle fans, but for future versions, I would suggest toning down the difficulty of the default levels, to increase the game audience.