So I was checking R. L. Stine's Twitter, and noticed this tweet.
(Direct link to the tweet: https://twitter.com/RL_Stine/status/759795056006008832)
It looks like Jack Attack will probably be the second entry in the SlappyWorld series. And before someone says "No it's not! It doesn't sound like a Slappy book!" Take a look at the Amazon description for Slappy Birthday to You:
"The evil dummy comes to life to tell his own twisted tales and scary stories!"
So yeah. Not all the books in the SlappyWorld series will be about Slappy himself.
But that's not all. Stine also tweeted a little tease...
(Direct link to the tweet: https://twitter.com/RL_Stine/status/758786114312339456)
Exciting stuff. I look forward to 2017, and it's just right around the corner too.