I've played this level twice, and both times, the Demolition Expert disappears. I can't use him to remove obstacles, so the level can not be completed.

I gave it stars to begin with - but I got to 4:6 and it did exactly what happened when I had downloaded it from BigFish - this is an expanded version. Multiple thumbs down. It collapsed and gave me a huge icon that I couldn't exit from. It is now frozen whenever I load it. So Craig seems to have a different problem but it amounts to the same thing - this game is unsolvable and I don't think that I want to risk Portals 2...

I want to but this and yesterday it had add to cart and now no longer has add to cart, so I can't buy the game

Seems like they really missed an opportunity to stream line the game with the plants. I was disappointed as I progressed and noticed that they didn't add spots for the plants near every resource. The maps also don't flow very well and when I saw Portals, I thought we'd be utilizing portal tech on the maps, instead of the Portals just being a goal. Oh well, I'll still finish the game, it's ok, just not as good as the others in the series....