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This is an upgraded version of the Image Gallery Template. Because of that, I suggest you understand that first before trying to understand this.

I deleted the existing gallery and created multiple galleries: GalleryA, GalleryB, GalleryC, GalleryD, GalleryE.
I added a gallery_navigation.rpy which is used to view other galleries.
The script.rpy has options to unlock the CG/image's conditions.
screens.rpy' ShowMenu("gallery") is now ShowMenu("galleryA")

You can watch this preview to learn more: