ey there! I'm Santiago P., tester and translator at ZeoWorks and also developer of this game.
You might have a lot of questions about what the hell this is all about, so I'll answer some of them before we begin.

What is this?
The Apocalypse DLC is a free standalone expansion to Slendytubbies III. This is a continuation of Chapter 3, and takes place 3 months after Multiplayer. I don't want to say too much though, I'll let you play it instead!

Why a standalone DLC and not an update?
I decided to release it as a standalone DLC for a number of reasons, such as reducing file size, using an updated version of the Unity engine, and me working on the development of the chapters instead of Sean (like it's always been). Originally, we wanted to release more chapters as updates to fill the gaps we left on the campaign, but we decided to scrap the idea and focus on making original, more serious projects. This is also the reason why Slendytubbies III isn't getting as many updates anymore. While Sean is working on other stuff, I decided to take over this project and fill the gaps on my own (with of course Sean's assistance). This is my first time developing a game on my own (and actually releasing it), so of course there might be a few issues.

Does this mean it's canon?
Yup, it's all canon. However, you should keep in mind I'm writing the chapters on my own this time. This means style directions may be different from the original game.

So... which ending is the true ending?
This is another question that people's been asking for ages, yet we've already answered many times. All of the endings are canon, you decide the fate of White Tubby. There's no "definitive ending" or alternate timelines, it's all the same, you just decide how it ends. You might be wondering how this will work in the game. I'll get to that in a minute.

When is the full game coming out?
I don't want to promise anything, but I think the full game should be ready by around late 2019. Yeah, it's a long time, but it's also a big project. It's going to be a three-part chapter with a total duration of 2 (estimated) hours. All of the endings will affect the game in different ways, so this means I have to make 4 different chapters and 12 parts, that's like 4 times the original campaign! And considering the demo is just half a part and took an entire month to make (and it's only affected by one ending), it's a lot of work, so please understand these things take time.