This is a fun and extremely challenging take on Snake. I can confirm that it works just fine on NTSC hardware. Tested on a C64c using 1541 Ultimate II+. It is super fast though and just as frustrating as the description would have you believe. After 10 minutes of playing my high score is still only 20 and I only get points on about 25% of games. They should use this game for response time training! All in all it is definitely worth a play!