The Complete History of Lemmings.
We did manage to fox Psygnosis now and then, and I can lay claim that it took John White an hour to figure out “Its hero time”. When ever psygnosis did some testing, we’d get back a fax with the level name, time taken to complete, and some comments and a difficulty rating. These were usually aound 3-6 minutes, and some general coments on how they found it.
Every now and again though, the fax would be covered in scribbles with the time and comment’s crossed out again and again; this is what we were striving for while we were designing the levels, and it gave us all a warm fuzzy feeling inside.
(Yet another good link via O’Reilly Radar)