fnaf 3 dx is a part of five night's at freddy's the deluxe collection, it has 4 games ( 2 of them are available now and 1 is in progress) and the games are, fnaf 1,2,3,4 and fnaf 1 and 2 are now available and fnaf 3 is in progress, and to run these games you need a copy of fnaf from steam (but the games are only on pc and only on windows), and in the games there are some easter eggs and secrets, one of them is that both fnaf 1 and 2 have a night 8, but to access it you need to type in a secret code in custom night, and the animatronics in the nights are also from other fnaf games like, in fnaf 1's night 8 the animatronics are: phantom chica,phantom bb,phantom freddy,springtrap, and all of them are from fnaf 3, and in fnaf 2's night 8 the animatronics are:
spring bonnie (but the devs misspelled the name with sping bonnie in the night tutorial), and fredbear. both the animatronics are from fnaf 4, so if fnaf 3 will have a night 8, i guess it will have sister location animatronics... but all the games are on gamejolt, heres the link
https://gamejolt.com/games/FNaFDX/798798