Great! thanks for letting me know. I thought that maybe I was doing something incorrectly.

@ Quag HY! The most important is the NE2-Mod, as well as the "Environment Changer" -Mod (is responsible for the theme selection). The error message is known and occurs with all cards that need their own theme! You can therefore ignore the error message (click Yes) and play the card!

I could use some help with a problem that I think is not specific to your map as I have seen this issue on other maps. It's just that I am not familiar with cities skylines enough yet to get everything running smoothly. When I start a new game in CS, I choose New, then your grand canyon map. under the custom map theme drop down, I choose grand canyon theme. (I did read in your notes and have downloaded the network extensions 2 mod along with the bonita vista valley and daylight classic, along with all of the prerequisites for those) But then, I get the warning message that "the custom map theme used by this map or save is missing and that a default theme will be used.
From my point of view I have the correct theme subscribed to along with all the prerequisites. Can you please tell me what I am doing wrong? Your map looks great and I really want to play on it with all the intended settings and themes etc... Thanks in advance for any help you can give me.

so nice

For that time when you want to desecrate an ageless national monument
10/10

Absolute great map!