Almost all sources on the net point to June 1985 or around 1985. My bet is that atarihq.com's article on the history of Tetris is the origin. That article has been around for a long time. Other sources like BBC's documentary says spring of 1985. I'll have to see what Game Over says later, but I don't have access to that book right this moment. Anyway, the reason why I bring this up is because I always thought it was weird that tetris.com's timeline puts Tetris's birth date in 1984. I didn't think much of it until just yesterday I was reading an interview with Henk Rogers which states "Rogers is planning something special for Tetris' 25th anniversary later this year." Later this year is 2009, and 2009 minus 25 is 1984. Did BBC mean spring of 1984? Have we all been getting it wrong all these years? What do you guys think? Any leads?