Well isn't that nice. Sierra Entertainment's letting King's Quest - Chapter I: A Knight to Remember go for free on the PlayStation Store right now. You can grab it via the web store by clicking through here.
The adventure title combines a branching narrative with some light puzzle elements, and as far as we're concerned, it's a pretty decent release that's at least worth a download. Who knows, you might get hooked.
Think that you might be giving this one a go? Awkwardly wander around and look for a missing item in the comments section below.