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Welcome Screen to instruct the game
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Home Screen where you can build and try to solve today's challange or guess other's submissions from Call It. Also various other screens.
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Today's challange is knocking the pin down. Use various pieces to achieve the challange
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You can check info icon for piece details. You have limited piece usage
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Simulate and submit. You can submit succed ones or even failed ones to fool the others if it looks like passing.
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After submission you can play other player's submission and guess their results
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Guess other player's submissions. It may look like not passing but be careful, it may pass. Or vice versa.
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No point is gained, you guessed as "flop" but it passed!
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Profile showing various stats and also have settings for detailed configs
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Result screen where you can review and share your result
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Share your result to the thread as response which shows how many of other player's submissions you have guessed correctly
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Community highlighted shares to play
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Leaderboard which shows points for different categories
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Practice levels where you can play as a single player to solve predefined levels
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Time Machine for past days where you can play past days
Inspiration
Reddit runs on one impulse: people love to call it — to predict, argue, and be proven right. Physics sandboxes like The Incredible Machine are satisfying to build in, but solitary. We fused the two: a daily physics puzzle where the real game is reading everyone else's contraption and betting on whether it'll work — and building one that's secretly rigged to fool the crowd. The name says it twice: you rig a contraption, and a great rig is rigged to fool the eye.
What it does
RIGGED is a daily physics-prediction game that lives inside a single Reddit interactive post.
- BUILD — each day sets one goal ("sneak the ball under the ceiling into the bucket"). Drag physics pieces to solve it, simulate, and publish. Your run is recorded.
- CALL IT — see other players' rigs frozen before they run, and predict each: WILL WORK or WILL FLOP. Reading a deceptive rig right pays 2×.
- REVEAL — the rigs run. You score on correct calls; builders score on their surprise rate — the percentage of predictors they caught out.
Three score tracks: POINTS (predictor accuracy), NAILED IT (a rig that looked doomed but worked), and LETDOWN (looked solid but flopped). Plus daily streaks, a tier ladder (Greenhorn → Kingpin), spoiler-free share cards, and a library of community challenges to beat.
How we built it
- Devvit Web: a Phaser webview client + a Node/Hono server + Redis, inside a Reddit interactive post that expands from a splash preview.
- Real physics: Phaser + Matter, fixed-timestep and manually stepped so every run is deterministic.
- Deterministic record-and-replay — the hard part. A published rig must replay identically for every predictor and re-verify server-side. We keep three physics evaluators in agreement: the in-game reveal, a headless "bake" that computes ground-truth outcomes, and a server-side recording verifier.
- Cold-start content: daily rigs are procedurally generated, physics-simulated, and balanced (work/flop), so there's always something to call; real player rigs take over the feed as people publish.
What we learned
- Cross-engine determinism is genuinely hard — two "identical" runs can diverge on body insertion order or a knife-edge contact. The fix was designing for robustness (large-margin mechanisms) and verifying every level end-to-end.
- Prediction + deception is a stronger hook than building alone.
- Reddit's constraints (no free text, mobile-first, spoiler-free) made the game tighter and better.
Challenges we ran into
- Fair goal detection: a bell that only rings at the dome (not when the ball sneaks under it), a bucket that only counts when the ball truly settles — each applied identically across all three physics engines.
- Difficulty balancing: we measure every level's solvability against hundreds of simulated attempts and tune the geometry to stay fair yet deceptive.
- Fitting a live, deterministic Matter simulation into a mobile Reddit post.
What's next for RIGGED
Crowd-prediction on community-designed challenges, live creator analytics, and seasonal themed events.
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