If you're looking for something to replace Hidden Door, Lovelace Studio is another option worth considering. This community-driven multiverse platform offers an MMO sandbox experience where you can build, grow and interact with meaningful content alongside other players. It uses AI-powered toolkits to define and customize assets, stories and themes, and offers a living history of generative quests. The platform is designed to foster community engagement and is designed to be welcoming for long-term play.
Another option is StoryBee, an AI-powered story generator that lets you create stories by prompting it with a prompt or theme. It's got options like audio narration and a range of visual styles that can be customized depending on the genre and style you're going for. It's good for kids and adults looking for a creative outlet, with different subscription levels for different levels of use.
If you're looking for something a bit more focused on the tabletop RPG experience, LitRPG Adventures offers a suite of AI tools to generate game content for games like Dungeons & Dragons and Pathfinder. Generators for character backstories, random dungeons and detailed quests means it's good for tabletop RPG players trying to flesh out their campaigns. It's got tiered pricing and a collaborative experience with feedback mechanisms to improve the tools over time.