Better than the first. And the second one.
SHIFT. The epic Portal replacement of flash games has a new title in the epic series.
Shift 3 is basically the same as the first two, except now it has WAY more stuff and replayability. You can return to levels you already beat to find more secrets and awesome shiz.
Unfortunately, it still contains the shitty PORTAL references...oh, and it's big. And long. Not for quick play through people.