You operate a snake made of baloons. To control it, you can press the keys n or m to turn 90° left or 90° right. You must collect the @'s and avoid the *'s. Every step is worth 1 point, every step on the path is worth 5 points and every @ is worth 50 points. a highscore-list does not exist yet.
I used to program this game on a PET 2001 more than 30 years ago poking the screen-memory.