To access each different layer you need a Flow Tolerance Crystal. The deeper into the rock you go the more flow there is so you need more advanced protection from it. If you are still in Wired Wilderness, then you will soon have to buy one to move on to Schematic City.
Wired Wilderness – Free
Schematic City – 50 Gems
Mirror Mines – 100 Gems
You will have to depend on the offer websites, buying gems, or your friends to get these since there are no gem codes for downWorld. Hopefully you can move on and keep flowCrafting because it will be sad if you can’t.