Missing from series - (Dungeon Academy) Dungeons & Dragons: Goreball Scrimmage

[Zaltys]

Series: Dungeons & Dragons: Dungeon Academy - https://www.goodreads.com/series/3364...
Missing from the series:
- Dungeon Academy: Goreball Scrimmage (https://www.goodreads.com/book/show/7...) / Duplicate: https://www.goodreads.com/book/show/6...

Another tricky one.
Chronologically this takes place around latter half of book two, but this and the current 1.5 are a side-series aimed at even younger audiences.

So I don't know how this should be numbered. Clearly part of the series (same characters, etc.), but... *shrug*