Welcome, traveler. You've made it to the 5-2 level of the Tunnel of Unrelenting Despair. You're almost there.
We're not going to sugarcoat it: this level is a real challenge. The air is thick with the stench of despair, and the walls seem to close in on you from all sides.
But don't worry, you've got this. You've made it this far, after all. You can do it. Just keep moving forward.
Or, if you're feeling particularly masochistic, you can try The Bonus Level of Regret.
Or, if you're just here for the views, you can check out the Tunnel Views Gallery.