The Binding of Isaac: Rebirth is getting an expansion "that will almost double the amount of things you can do," developer Ed McMillen has announced.

"Once the holidays end, the Nicalis gang will be jumping back into the abyss and digging into the very large design doc I have ready for 'em," said McMillen on the game's official blog. "I have big plans for this expansion, I hope to add a very huge chunk of gameplay in the form of a new game mode that will almost double the amount of things you can do. I'm very proud of this new design."

"Aside from this new game mode the expansion will feature a ton more enemies, bosses, new areas, endings and a new playable character as well as a slew of new unique items to play with," he added.

McMillen is opening up the development process to the community by asking for suggestions for item effects on this Reddit thread. His favourite 10 of which will be implemented into the expansion.

He has a few general guidelines, however, such as "only suggest item effects" (i.e. not names/themes/visuals), "do not suggest redundant items" (i.e. weaker versions of already existing items), and "do not suggest overly complex items."

Upvote ideas you like and downvote the ones that break the guidelines. It will ultimately all come down to McMillen's faves, but feedback will likely help guide him to the cream of the crop.