Written by obit
on
The second black hole was an in-game trigger and wasn’t active at the launch of this version. By assigning it a default object letter Z, it avoided any conflict if there happened to already be a player-generated object at the same time, such as gold, plasma, ship debris, etc. it was much simpler to do it that way than to let it generate its own letter from the queue or come up with a timer or whatever.