What are the other messages in the Demo?
After 20 minutes:
"Remove exactly 50 total blocks - Speed drop power block".
After 40 minutes:
"Remove exactly 100 total blocks - Remove powers power block".
After 60 minutes:
"Remove exactly 150 total blocks - Remove stones power block".
After 90 minutes:
"Win 25 games, about 2 hours - Become a hero of Yahoo! Towers".

Don't think I would have really watched the Demo for that long time!