FantasySub

FantasySub is a fantasy Reddit sim where you grow a sub, craft viral posts with AI, battle trolls, and climb to front-page fame in a gamified world of karma, memes, and magical chaos.

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🧙‍♂️ Inspiration

Reddit is chaotic, hilarious, and addictive—so we thought, why not turn it into a game? We were inspired by the dynamics of running a subreddit and the daily struggle for karma and relevance. FantasySub takes that concept and wraps it in a whimsical, fantasy world where upvotes are magic, followers are NPCs, and trolls are literal monsters.

🧵 What it does

FantasySub is a Reddit-style simulation game where you roleplay as the moderator of a fantasy subreddit. You:

  • Craft posts daily (or let AI help).
  • Watch simulated followers react with upvotes and comments.
  • Grow your subreddit, unlock features, and battle rival subs.
  • Gamify your rise from obscure mod to front-page legend.
  • Compete across a map of fantasy-themed subreddits with unique cultures and engagement styles.
  • Post your posts to the r/fantasysub reddit group built with the devvit reddit api

The game generates fake AI-powered replies, scores your post based on engagement metrics, and simulates social dynamics, giving it the feel of a living community.

🔧 How we built it

  • Frontend: React + TailwindCSS for a Reddit-style UI
  • AI Logic: Gemini API for post evaluation and fake comments
  • Backend: Supabase for user sessions, subreddit growth, and post history
  • Game Logic: Custom scoring system for karma, follower growth, and engagement
  • Hosting: Netlify for quick deployment and testing

We also mocked up the UI in Figma, taking cues from the actual Reddit app for familiarity but adding our own fantasy twist.

🧱 Challenges we ran into

  • Balancing realism and fun: Making sure the AI comments felt Reddit-like but still whimsical.
  • Simulating engagement without actual users: Making it feel alive with fake but convincing reactions.
  • Scope creep: We had to resist adding too many RPG elements and focus on the core game loop.

🏆 Accomplishments that we're proud of

  • Built a full AI-driven feedback loop for posts that feels like Reddit.
  • Created a unique fantasy game that merges social media simulation and RPG elements.
  • Designed a working UI that looks like a Reddit clone but plays like a strategy game.
  • Balanced humor, gameplay, and AI in a way that surprised even us.

📚 What we learned

  • How to creatively apply AI to simulate human interaction at scale.
  • The power of UI familiarity in onboarding players quickly.
  • How game loops thrive on feedback—even fake ones!
  • How to use AI not just for content generation, but for game balance and player progression.

🧭 What’s next for FantasySub

  • More subreddit zones with unique mechanics (e.g., r/ElfConfessions vs. r/BattleSpells)
  • Troll raids and “Mod Powers” to defend your subreddit
  • Player-to-player crosspost competitions
  • A mobile version styled even closer to Reddit’s native app
  • Deeper follower AI so the community develops its own voice

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