Pandora’s having a very bad day. Against her better judgment, she opened that box, and now the world is overrun with demons and imps representing wrath, greed, gluttony, and sloth. But one disguised figure remains: Hope, cleverly camouflaged by a demon’s twisted logic puzzle.

In this clever animated riddle from TED-Ed, you’ll need to think like two fiendishly smart demons, Abaddon and Beelzebub, to figure out which imp is actually Hope in disguise. The answer depends on what they know, when they know it, and how you can piece it together before Pandora loses her last chance to set things right.

Can you solve the puzzle before the world loses all hope, literally?