I was browsing through the files on the TT wiki the other day and found some great old things! Nostalgia!
4 of mine are place holders, as they are EXP.In my case I think in how much time they wasted in designing blocks than they scrapped after. Maybe using placeholders next time or cheap designs, then upgrade them when they are for sure they will stay.
I'm not sure how long ago, but I think it was around the time of Terror Tech. I could be wrong, so don't quote me on it.how old is it?
What is causing you the confusion?If anything, now I'm even more confused.