It's surprisingly easy actually. Another paradox.

Edit:
And I am in the midst of a depression, so I really know that it doesn't feel like it. But if you realise that paradox it resolves: depression lifts. Like waves it can come and go. Makes you feel hopeless, almost like too much effort, but it's better than just severe depression, which makes you more hopeless still.

It's a puzzle, a game, at the very least a nice distraction.

Another:
But, paradoxically, severe depression only can be less severe: it ends quicker.

You can't win, but you can survive.