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From Jay: All programs have lots of limits. It is rare for people to know what those limits are, especially when they don't have access to the source code. All numbers will have limits, no matter the program. But those numbers can have different limits, depending on how the numbers are used internally. ZT does not save inside saved games what has been unlocked. Instead, it saves the current zoo date in the saved game. When ZT loads the saved game, it then looks at the current zoo date to see if it needs to unlock things again. But I don't know how ZT does that date check internally. There certainly would be a limit of some sort in that calculation, but I do not know what that limit is. I can give an example of another of ZT's limits. Buildings get their messages from ".dll" files. The messages are associated with ID numbers. The ID number has to be in the range of 0 to 65535. Sometimes ZT does calculations to determine an ID number. For tooltips for example, ZT looks for an ID that is 30000 higher than the specified ID. Many designers in the early days of ZT did not realize this. So they might use ID 8000 for the tooltip. It worked for a while, then suddenly a different message would be shown. That is because ZT added 30000 to that and looked for 38000. If ZT couldn't find 38000, it used 8000 for the tooltip. But if someone eventually created something using 38000, ZT suddenly starting using that for the first person's tooltip. Even more confusing is if the first person chose a high number for the ID for the tooltip. For example, they may have chosen 38000. ZT adds 30000 to that, giving 68000. That is higher than the 65535 limit. So the number wraps around, subtracting 65536 from it, giving 2464 as the ID to check. So I am sure ZT would eventually do something like that in its calculations for unlocking things. But I do not know what number would cause the calculation to wrap around and keep things unlocked instead of unlocking them. I have a zoo called ThisIsZootopia that is in year 25 and everything is unlocked. But I don't know if there was a point where things became unavailable again, and were unlocked again. We also know that unlock file names with "-" in their names can confuse ZT concerning unlocking things. But we have seen it the other way around, where it unlocks more than expected rather than less. Still, it is possible it can do both. I don't worry about things not being unlocked. I keep the Developer Menu Hack in my ZT. Among other things, that includes a button to unlock everything. So I use that when something is not available that I want to be.

Should have said this is a working building not just scenery like the one cricket updated.

About time I mentioned a DD file. Jay has just released a menu filter. This was discussed in this topic. Since the screen below he also added "Forest/Jungle"at my request. I wanted "jungle/rainforest" but that was too long. Combined Menu Filter Names