Fun easy game, not much depth and is alright for a few times through. I suppose it fits your description, although it could've used music and a mute button at the same time. I wouldn't have minded the incessant popping sound if I had a nice loop of typical flash game music although with silence the popping sounds become quite annoying. Other than that it's pretty solid for simplicity's sake.
If you need help with with Portal: The Flash Version check out this guide on COCAK
"link":http://cocak.blogspot.com/2007/12/challenge-cake-orange-hole-portal-guide.html
COCAK is the Kongregate Blog to go to if your ever in need of solving a challenge or completing a badge. Check us out at http://www.cocak.blogspot.com
Gamebrew: I'd like to start a feature on "COCAK":http://www.cocak.blogspot.com that showcases a game of the month, I've chosen Tactics to start it off, and I was wondering if you would be able to provide a interview based on the development of the game, from concept to creation.