I am slowly getting the hang of navigating space-time framework through use of these machines. However, I am finding it exceedingly difficult to go back through one. These portals appear to be one-way only! Since you are reading this, then you are now stuck in feudal Japan.  I believe you are in the royal palace. If anyone catches you there... well, I suggest you work fast. I have left you some new tubes that will help you unlock the next portal. Stay smart, stay safe.