Level Keys

[Uige]

I have an idea what level keys are, in-lore they allow wanderers to access certain levels from the hub, as long as the door is unlocked by said level key.. I assume this is the same in this game, however i have no idea where to find level keys, nor access to the hub. (i know it exists tho cuz you can get to it automatically using the sandbox mode)

[Techno09]

After you complete level 8 you can access The Hub and in each normal level you can find its corresponding key in boxes