As Portal 2 progresses, ... gel that makes you bounce or run at high speeds, pass over gaping pits with bridges of light and manipulate cylindrical tractor beams.

Like Half-Life 2, Portal was a personal journey, ... There are also now tractor beams and holographic bridges that work in the same way, ...

Portal 2's final chapter is a bombardment of time-sensitive puzzles meant to flex the portaling part of the brain you've been growing over the previous 10 ... tractor beams, turrets, bombs, ...

And I love the portal gun! It connects to points, and allows you to pass through them. To a robot like myself it's quite logical, but for a human, this will prove to be quite the excellent puzzler.