I've been searching online for this game for years, but have just discovered this thread. Maybe you can help? This is an old game - probably early to mid 1980s - I believe for the old Macintosh. It was the simplest and possibly the most addictive game I have ever played, with a single control input (the space bar). The play area was a black screen randomly scattered with white blocks, into which a single-pixel white line would move. Basically, your job was to keep this white thread on the screen, and prevent it from either shooting out of the bottom or shooting out of the top. When you pressed the space bar down, this acted as a kind of thrust and the line veered higher; when you ceased to press the space bar, the thrust also ceased and you immediately lost altitude. When you connected with a white block, the line ricocheted back and began traveling in the opposite direction. Your objective was to keep the line in existence for as long as possible, bouncing back and forth between the white blocks and not coming into contact with any of the edges of the screen, at which point your game was over. Because the white blocks were randomly scattered, some play areas were inevitably more conducive to long play periods than others, and the absolute best configuration (which came along once in a blue moon) was two reasonably tall vertical pillars of white blocks, into which you could pilot your white line and bounce back and forth for whole minutes before you misjudged the thrust and careened either out of the top or the bottom and died. It was insanely addictive. We used to play it for hours, just moving that white line, and when I left my friend's house and walked home in the rain I felt ... sullied. But I digress. I have one big clue -- in addition to the above -- which is that I believe the game's title was REBOUND. However, I have searched high and low and have not come across even so much as a reference to this game anywhere in the vastness of the internet. Does anyone even remember playing this game? Please help!