Packages

The repository ships 60 packages under packages/. A package is a Rust crate that adds components, systems and script commands to the engine; see Custom Rust Components & Packages for how they work and how to write one.

Each page below is generated from the package itself: its registrations are read from the source, and its prose is the package’s README or crate doc.

Built-in packages

Linked into the stock native runtime, web build and editor viewport. A project switches them with settings.enabled_packages.

Package	What it is	Script namespace	Components
jengine-audio	Audio package for jEngine — kira-based sound effects and music	-	1
jengine-parallax	Parallax scrolling background package for jEngine — multi-layer depth-based scrolling	Parallax	1
jengine-particles	Particle system package for jEngine — 2D particle emitters and simulation	-	1
jengine-physics	Physics package for jEngine — rapier2d-based rigid body physics	-	4
jengine-swarm	Flocking / swarm AI for jEngine - spatial-grid boids that scale to thousands of entities	-	2

Project packages

Linked only into the builds of a project that lists them in project.jengine’s "packages" array. Most were written for a game in projects/arcade-classics and are reusable on their own.

Package	What it is	Script namespace	Components
jengine-adventure	Point-and-click adventure - verbs, rooms that remember, and a game proved winnable from every state it can reach	Adventure	1
jengine-blast	Bomberman - a destructible grid, blasts that chain, and a map that can be refused for trapping somebody	Blast	1
jengine-blob	Soft bodies that split and join: Quiver Pond	Blob	1
jengine-borough	A living town: villagers with needs, skills and moods who pick their own work by priority, buildings and work orders, hauling and trade done by the people, districts bought or conquered, and a storyteller that writes the town’s chronicle	Borough	1
jengine-brawler	A beat-em-up: a floor where y is depth, attacks that must line up in it, grabs and throws, weapons, and a crowd that surrounds rather than queueing	Brawler	1
jengine-burnline	You are the missile: steer through a neon maze to the target before the fuel runs out, and every missile you lost flies again beside the next	Burnline	1
jengine-cards	Deckbuilding roguelike: data-driven cards, enemy intents, statuses, a run map with rewards, rests and shops	Cards	1
jengine-chase	A maze chase: four pursuers that each pick a different tile to aim at, scatter and chase waves, and the cornering that makes a maze feel like one	Chase	1
jengine-city	A city builder - zones that grow by demand, power and water networks, traffic, land value, a budget and disasters	City	1
jengine-crawler	A first-person grid dungeon crawler: stepwise movement, a view assembled from depth slices, doors and levers, traps, and fights fought from the front rank	Crawler	1
jengine-derby	Destruction derby: cars with tyre forces, torque curves and gearboxes in the package’s own rapier world, damage by zone (corners, sides, engine, each tyre), and bots that ram	Derby	1
jengine-dungeon	Dungeon crawling: level generation, field of view, turn-based combat, items, monster AI	Dungeon	1
jengine-fighter	A fighting game: frame data as data tables, hit and hurt boxes, an input buffer with motion inputs, and a deterministic match that runs on frames	Fighter	1
jengine-glass	A light puzzle scored by the renderer’s own light, and Vesper Glass	Glass	1
jengine-goldbox	A party of six across three packages - the first package here that depends on another	Goldbox	1
jengine-grid	Grid games: a self-drawing cell board with layouts, and a snake that steps on it	Grid	4
jengine-gunner	A top-down run-and-gun: a battlefield that scrolls under you, aim decoupled from movement, grenades that arc over cover, and prisoners worth going back for	Gunner	3
jengine-homestead	A homestead’s rules as plain data: a plot to till, plant and build on, crops grown from timestamps (offline included), inventory and crafting, resource nodes that respawn on a clock, and a community project everyone builds	-	0
jengine-horde	A four-player arcade dungeon: hundreds of chasers following flow fields, generators that must be broken, and health that drains all the while	Horde	2
jengine-idle	An idle game: generators and upgrades as data, a prestige that trades the run for a bonus, and offline progress from the wall clock	Idle	1
jengine-kotoba	Word tiles: kana placed one at a time where they make a word, read across or down - a timed puzzle, a real-time word battle with combos, a bot, and a Japanese dictionary with meanings	Kotoba	2
jengine-lantern	Torch-lit descent - darkness as the mechanic, gameplay light sampled from the same model the renderer draws	Lantern	1
jengine-launcher	A physics launcher: materials, ammo and levels as data, structures built as real bodies, and damage from the impulse of a contact	Launcher	1
jengine-lockstep	Two-player lockstep turns over jengine-relay, and Two Shores (Reversi) on top	Lockstep	1
jengine-market	An order-book market - limit and market orders, price-time matching, escrow, NPC producers and consumers, price history - the economy of Saltwind	-	0
jengine-microgame	WarioWare-style microgame compilation - a queue, a countdown, a speed that ramps, and a one-call verdict contract	Microgame	1
jengine-net	WebSocket transport, connection lifecycle and a script-reachable message bus	Net	0
jengine-online	A game’s side of jengine-server: sign in, join rooms, and show synced entities	Online	2
jengine-paddleball	Paddle-and-ball arcade physics: swept ball collision, paddle deflection, input and AI paddles	Paddleball	4
jengine-paint	Paint by numbers three ways - pixel, zones and picross - and Little Easel	Paint	1
jengine-pinball	A pinball table: the ball is a real rapier body with continuous collision, the flippers are kinematic transforms, and the table’s outline is checked closed before a ball is ever released	Pinball	1
jengine-platformer	Platformers: hero feel (coyote time, jump buffering, wall jumps, dash) and level parts on the engine’s character controller	Platformer	9
jengine-racing	Top-down racing: a track spline that answers where you are and how sharp the next bend is, a car that slides, drivers that follow the line, and ghosts replayed from recorded input	Racing	1
jengine-rally	Point-to-point rally stages: seeded stages checked drivable, pace notes read off the geometry, damage between services, and ghosts recorded as input that replay bit for bit	Rally	1
jengine-rampart	Wave defence where the searchlight is the targeting - one light set read by the shader and by the game	Rampart	1
jengine-realm	An Ultima-style realm: a world of linked maps, a clock the people live by, conversation you type at, and tactical grid combat	Realm	1
jengine-rhythm	Rhythm games: a beat clock locked to the music, note charts from data tables, hit windows, holds and scoring	Rhythm	1
jengine-rig	A vehicle as a chassis and wheels joined by motorised revolute joints, on terrain built from thick convex quads	Rig	1
jengine-route	Pointer-drawn routes flown by the engine’s steering components, and Crosswind (air-traffic landing)	Route	1
jengine-rpg	Monster-collecting RPG: grid overworld, NPCs, tall-grass encounters, turn-based battles	Rpg	4
jengine-rts	A real-time strategy game: one flow field per destination, orders, fog of war, production queues and an opponent	Rts	1
jengine-runner	An endless runner: chunks as ASCII drawings in data tables, a difficulty that follows the distance, and a grid-exact character	Runner	1
jengine-scaler	Pseudo-3D sprite scaler - a road bent at projection time, and a hill that hides the road behind it	Scaler	1
jengine-settlement	A world you dig and build in - tile edits as the main verb, support that collapses, and growth that settles on change rather than per frame	Settlement	1
jengine-shooter	Space-shooter mechanics: a wrapping field, inertial ships, shots, splitting rocks, saucers and an AI pilot	Shooter	12
jengine-skills	An isekai-style skill system - skills learned by use, levelled, evolved and fused, chanted spells, unique skills - as data tables; the rules of Reborn in Lumeria	-	0
jengine-solitaire	Klondike, FreeCell and Spider with deals proved winnable, and Green Baize	Solitaire	1
jengine-stand	A lemonade stand’s economy, simulated a day at a time, and Lemon Row (a management sim played entirely in entity UI)	Stand	1
jengine-stealth	Guards who see in cones and hear in circles, alert states that decay, and a level whose line of sight is exact because the grid is the map	Stealth	2
jengine-sudoku	Sudoku under six rules - generated with one answer, graded by the logic a person uses - and Ninefold	Sudoku	1
jengine-tanks	Toy tanks: shells that ricochet off walls, mines that blow cork, tanks that aim by the rebound and dodge, a campaign of missions each proved by a bot, and versus rounds - one fixed-step sim for a local game and a server room	Tanks	1
jengine-tap	Tapping games for more than one finger: Burrow Bop and Ivory Lanes	Tap	2
jengine-td	Tower defense: a maze the player builds, waves that path around it with the engine’s tilemap A*, towers and upgrades; or fixed roads with soldiers, a hero and spells	Td	2
jengine-tide	A survivors-like: thousands of enemies simulated in flat arrays over the engine’s shared broadphase, weapons that fire on their own clocks, and a level-up draft that can never offer nothing	Tide	2
jengine-walker	A creature that walks on legs it places itself, and Stilt Fen	Walker	1