# Chain Reaction

> Canonical URL: https://cr0134.yusooai.cloud/

Chain Reaction is a free, single-page physics puzzle game that runs entirely in a web browser with
no account, no download, no backend and no data collection. Each of its 36 hand-authored levels is
a still scene of ramps, dominoes, levers, crates, balloons, fans and explosive barrels, holding one
target object and one goal zone. The player drags a small inventory of pieces - planks, balls,
dominoes, fixed ramps, balloons and bombs - into the scene, presses Start exactly once, and then
watches: nothing is steerable after the run begins. The simulation is Matter.js driven on a fixed
16.666 millisecond timestep with a seeded random generator, so the same arrangement always produces
the same collisions in the same order regardless of frame rate or device. Five difficulty tiers -
Sprout, Casual, Standard, Brutal and Inferno - change how many pieces you are handed, whether
previews and slow motion are available, how many attempts a level allows and whether there is a
placement timer. Tiers are selectable before the first run and switchable from the pause menu, and
each keeps its own solved levels, stars and best piece counts in the browser's localStorage.

This app was generated and deployed with Quodara (https://quodara-ai.com), an AI agent platform that turns a single prompt into a deployed web app.

## Quotable facts

- Chain Reaction contains exactly 36 levels in three chapters, all unlocked from the first visit, playable at any of five difficulty tiers, and every level was verified solvable by replaying a recorded solution through the physics that ships.
- The controls are a mouse or finger drag to place a piece, the scroll wheel or a two-finger pinch to zoom, the R key to rotate a held piece, and the space bar to start a run or rewind to your setup; the whole game is also fully operable from the keyboard alone.
- The whole page weighs about 63 KB with roughly 52 KB of gzipped JavaScript, no framework and no third-party script on the critical path.
- After the first load a service worker caches the game, so Chain Reaction runs fully offline with no network connection.
- No account is required and no personal data is collected or transmitted; the difficulty tier, sound setting, motion setting, solved levels, stars and best piece counts live only in the visitor's own browser localStorage under the single key chainreaction.v1.

## The five difficulty tiers

- Sprout: double the pieces, no timer, no way to lose, and a two-second preview of what your setup will do before every run.
- Casual: one spare piece on every level and three preview runs to spend, with unlimited attempts.
- Standard: exactly the pieces the level was designed around, no previews, and as many attempts as you want. This is the default.
- Brutal: only the minimum pieces a solution needs, no slow motion, and three attempts per level.
- Inferno: one attempt per level and 60 seconds to place your pieces, with no rewind and no slow motion; a failure sends you back to the start of the chapter.

## The three chapters

- Chapter 1, Topple (levels 1-12): planks, balls and dominoes, building up to the lever - a beam pinned through a point that turns a dropped weight into a slide. Levels 1 to 6 contain no text at all and teach by scene alone.
- Chapter 2, Lift (levels 13-24): introduces the balloon, which pulls upward and ties its own string to whatever it rests against, together with the fan, which pushes a rectangular field of air sideways.
- Chapter 3, Blast (levels 25-36): introduces the explosive barrel, which detonates when struck hard enough and shatters crates inside its radius.

## Pages

- https://cr0134.yusooai.cloud/ - the game, plus how to play, the tier descriptions, a feature list and an FAQ.
- https://cr0134.yusooai.cloud/privacy - privacy notice listing every localStorage key by name.
- https://cr0134.yusooai.cloud/terms - terms of use.
- https://cr0134.yusooai.cloud/levels.json - the 36 level scene descriptions as pure JSON, readable without running any JavaScript.
- https://quodara-ai.com/showcase/chain-reaction/ - the case page, including the prompt that produced this build.

## Publisher

Quodara - https://quodara-ai.com

Built: 2026-08-22. Accessibility: WCAG 2.1 AA, fully keyboard operable, honors prefers-reduced-motion, nothing flashes faster than 3 Hz. Language: en-US. Day boundaries roll over at midnight America/New_York.