Valve Software booth had a theater ready, showing off the co-op mode of Portal 2 in real-time. That alone was enough to bring many excited people lined up for the show.

Fun, it was.

One thing we’ve noticed is that now you can use the infinite loop within two portals as a strategy.

As we stated, the demo was in real-time so we couldn’t get the full version of the co-op demo. But we have the teaser of the co-op mode.

Check out the Portal 2 website if you cannot get enough of it.