I finally got curious enough to look up where all this more advanced portal stuff was coming from(I've only played the flash version) and I was very surprised! The prints, the aperture science symbol, the voice! it's all from portal!!! I want to get the game, but there's no WAY I'm buying Half Life 2 just to play it. How does that work anyway? But still, now even I want to make a portal build! The game portal kind of creeps me out, but it's funny! The turrets are freakiest part, how they talk to you, but I love some of the things the voice says, like "enhancing the truth" and "bring your daughter to work day", it's a really good game it looks like! But blockland is STILL better :)