In a game that so proudly draws inspiration from legendary 2D exploratory shooter Metroid, it's no wonder that Axiom Verge is filled with plenty of alternative routes and secret worlds, encouraging you to keep playing through it again and again. In every Axiom Verge play-through, there are two easy, two medium and one hard randomly-generated secret world for you to find. You know that you're approaching one of these secret worlds because the screen gets a glitchy, distorted appearance that intensifies the closer you get to the portal. It's only in the hard secret worlds however, that you'll find a secret weapon - only one of which can be obtained on each play-through. The exact location of the hard secret world varies on each play-through, but will be in one of three areas in the game - Edin, E-Kur-Mah or Mar-Uru. The above map shows entrances to all the possible locations of secret areas in the game, with the hard ones marked out by the orange squares.