This short guide will help you to easily obtain the blue key and unlock the achievements “Blue Key” and “The Passage”.
How to walk through the passage
When you pass the upper laser, walk towards the wall shown in the picture. Once you walked through, “The Passage” achievement will pop up and there you go, get the blue key and the respective achievement (I had to draw the key on the screenshot since I took it after picking up the key).
If you played through and are stressed by the idea that you’d have to pass 17 levels just for a useless key, but you urgently want to complete the game, DON’T WORRY. All progress is saved and you don’t have to pick up all keys and key cards again. Simply walk through the previous 17 levels until you reach level 18.
How to get to the secret levels
You can pass the first level by walking between the two lasers forth, back and forth again. Yeah, this one’s a bit more difficult than most regular levels and definitely doable.
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