Yes, it is a seven-day game jam with "Mega" in the title, but no – this is not the Epic MegaJam. Apparently, that is still to come.

The Mega Stack-O-Jam is a new game jam that forgoes the usual theme and instead asks you to build something original using the recently-updated Stack-O-Bot sample game project. The jam will kick off during tomorrow's Inside Unreal live stream, and will conclude on August 21, 2025 at 11:59 PM ET.

Find your way to the jam's official itch.io page to register your participation and read all the details, including rules, prizes, and resources.

Looking for tips on how to survive the game jam? We published a guide for the 2023 Epic MegaJam, and many of the tips still apply today.