Age of Cybernetics (Time IV Zone) is done!! I'm excited about this one; I haven't played it much in person yet, and it seems like it could lead to craziness. Also, I made a pretty fundamental change to the way cards as objects are handled, so there's a chance some stuff that used to work is buggy now. It seems to work fine, but I haven't tested every zone/card with the new code.
*Edit* Age of Cybernetics is now optional, as per the actual card text. Which makes me ask.. Donald, is there a particular reason that Age of Cybernetics, Cats, & Toys are "may"? As already discussed, there's rare edge cases where you would want to visit the zone and just do nothing at all that turn, but they are so very rare... it just seems like the cards would have been simpler to make those types of effects mandatory.
Another note... there's a known bug with Age of Cybernetics that should come up in a game basically never. If you copy Investments or Treasure Map, and then discard the copy for the effect, it doesn't revert back to the original card. So if you actually go through the whole deck after doing so, and re-draw the original card, you'll draw an additional Investments/Treasure Map instead. Not worth fixing at the moment since it's just so rare.