Mark Cerny PS4 PlayStation 4 The Witness 1

Anyone who earns the Platinum in Jonathan Blow's brilliant The Witness deserves an honorary PhD. Mark Cerny, the architect behind the PlayStation 4, is the latest to 100 per cent the release, following in the footsteps of our very own Simon Fitzgerald. Better order the gowns, guys – it's graduation time. And there's still a chocolate Hobnob on offer if you can pull it off, Stephen.

Seriously, though, if you haven't played the game yet, puzzling your way through The Witness' brilliantly varied districts is difficult enough, but its secret challenge is even harder. We won't spoil it for those of you who haven't reached it yet, but let's just say that it requires you to master its rules in a god-like kind of way. We get a headache just thinking about it.