Hitting the information boxes (e.g the one at the start of level 2 before your go down the pipe) causes the game to become unresponsive forcing you to quit.
I just replayed this, and I waited a little after hitting it since I thought it was because the game was using a big font (7MB) but it was able to resume
Don't know why that is, unless it's a system performance thing
Hitting the information boxes (e.g the one at the start of level 2 before your go down the pipe) causes the game to become unresponsive forcing you to quit.