KarmaFoundry — Daily Reddit Boss Battle

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  One-screen “How it works” onboarding. Explains energy mechanics, multipliers, and daily reset in under 5 seconds — optimized for judge

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  user game play

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  Real-time leaderboard ranking top contributors by energy contribution. Encourages cooperative competition while maintaining subreddit-wide.

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  Daily boss battle interface. The community works together to reach 10,000 Energy before reset at 00:00 UTC. Designed for clarity,.

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  Core gameplay view. Community engagement (upvotes + comments) converts into shared Energy while Boss HP decreases. The Audit panel shows.

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  user audit screen

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  Moderator-only Demo Mode with cooldown + daily cap. Clearly labeled to ensure fairness and judge-safe testing. Includes mod-only “Reset Day.

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  boss defated

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  vote screen

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  claim reward

Inspiration

Reddit communities generate massive engagement every day — thousands of upvotes, comments, and reactions — but that energy disappears into passive metrics.

We asked a simple question:

What if Reddit engagement became a shared, visible goal?

KarmaFoundry was inspired by cooperative boss battles in games, where every small action contributes to a larger collective victory. Instead of isolating engagement, we turned it into a daily community-powered event.

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What it does

KarmaFoundry transforms Reddit engagement into a daily cooperative boss battle.

• Upvotes + comments generate shared energy
  
• Energy reduces Boss HP
  
• Downvotes create pressure (net negative impact, capped)
  
• A daily vote activates a temporary multiplier
  
• When energy reaches 10,000 → the boss is defeated
  
• Members can claim once per day
  
• Everything resets at 00:00 UTC
  

The result: passive engagement becomes an active, shared goal.

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How we built it

KarmaFoundry is built using Devvit 0.12 Web with a modern client/server architecture.

Backend

• reddit.getPostById() polls post stats every 10 seconds
• Delta-based calculation (only new comments/upvotes generate energy)
• Anti-spam caps (100 comments / 200 upvotes per poll)
• Net downvote pressure with safety caps
• All state stored in Reddit KV (KF:v1 namespace)
• Daily reset logic at 00:00 UTC

Frontend

• React (Vite) client
• Glass morphism UI with CSS design tokens
• Real-time progress bars (Energy + Boss HP)
• Mod-only Demo Mode (cooldown + daily cap)
• Transparent Audit panel (poll intervals, caps, multipliers, event log)

Animation

• GameMaker HTML5 export embedded via iframe
• postMessage bridge for:
  • CINEMATIC_START
  • CINEMATIC_VICTORY
  • CINEMATIC_END
• Screen shake + victory overlay sequence

This is fully wired to real Reddit engagement — not a mock.

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Challenges we ran into

1. Reliable delta tracking

Reddit exposes aggregate stats, not event streams.
We implemented cursor-based delta tracking to ensure only new activity generates energy.

2. Anti-spam protection

Without caps, one viral burst could instantly complete the goal.
We introduced per-poll caps and multiplier limits to maintain balance.

3. Demo safety

Judges need a repeatable demo.
We built a mod-only Demo Mode with cooldown and daily cap, clearly labeled to prevent manipulation concerns.

4. Daily reset correctness

Time zone handling required strict UTC-based resets to avoid inconsistent states.

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Accomplishments that we're proud of

• Real-time Reddit engagement integration
• Fully transparent Audit panel
• Production-minded anti-spam safeguards
• Daily reset system with KV isolation
• Victory cinematic with animation trigger
• Mod-safe demo mode with cooldown + cap
• Clean, mobile-responsive UI

Most importantly:
We turned passive Reddit activity into a shared daily win.

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What we learned

• Devvit 0.12 enables clean client/server separation
• Poll-based engagement systems require strong guardrails
• Transparency builds trust — especially in community games
• Clear UX explanations dramatically improve judge clarity
• Emotional payoff (cinematic win moment) matters

We learned that community mechanics must be:

• Fair
• Visible
• Repeatable
• Trustworthy

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What's next for KarmaFoundry — Daily Reddit Boss Battle

Future directions:

• Cross-post cooperative events between subreddits
• Weekly mega-boss events
• Community unlock tiers
• Cosmetic upgrades earned by participation
• Dynamic boss personalities per subreddit theme
• Real-time WebSocket support if Devvit expands streaming APIs

KarmaFoundry can evolve into a reusable engagement engine for Reddit communities.

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KarmaFoundry turns passive engagement into shared momentum — inside Reddit.

Built With

• css
• devvit-0.12-web
• gamemaker-studio-(html5)
• postmessage
• react
• reddit-developer-platform
• reddit-kv-storage
• reddit-post-api
• typescript
• vite