This is an incredibly addictive game... although it gets difficult quick.

You have to make portals to finish the level... you can only make 2 at a time..
Just try it. its easy to learn but gets difficult.... dont forget the R button will close all of the portals...

http://www.newgrounds.com/portal/view/404612

lvl 15 is difficult... I was stuck for a while

Er... Java version? That looks distinctly like Flash to me. In fact, it's even titled "Portal: The Flash Version".

stuck on 15 as well

Oh yeah, 15 was tough. I think I got through that mostly on luck. I'm on 23 now.

I played through this a few months ago. It gets very tough towards the end.

Wow this is awesome. I've been playing this for the past three hours or so. SOOO ADDICTIVE.

Redchigh, you are officially cool. As far as i care anyway.

The game has a few clipping issues when it comes to portals and narrow walls, but otherwise is pretty solid. I remember playing through the first ten or so levels without realizing that there was a jump button...and even longer without realizing that I could grab items with the gun. Heh.

It's ok. The real Portal is better, but this one is free, so maybe it balances.