--- title: "Three-lane 3D runner: API" package: "@phaser-ae/lane-runner-3d" tier: Pro version: 3.0.0-3 released: 2026-10-14 updated: 2026-10-20 description: "The rules of an endless lane runner seen from behind, where you swipe between lanes, jump, roll and run the roofs of trains, collecting coins and power-ups." url: https://phaser.io/packs/lane-runner-3d/api site: Phaser - https://phaser.io --- # Three-lane 3D runner: API `@phaser-ae/lane-runner-3d` — Endless lane runner: swipe between lanes, jump, roll and fast-fall past trains and barriers, run the roofs, collect coins and power-ups, as in Subway Surfers. ## The pack ### `laneRunner3d` ```ts function laneRunner3d(): Pack<{ laneRunner: LaneRunnerApi }> ``` The `lane-runner-3d` pack: `game.laneRunner`, Subway Surfers' rules on runner-core. No options. ## Helpers ### `createLaneAutopilot` ```ts function createLaneAutopilot(game: LaneRunner, options: LaneAutopilotOptions = {}): LaneAutopilot ``` A lane run's autopilot. It never touches `game` but to read it; give the moves it returns to `game.input`. ### `createLaneRunner` ```ts function createLaneRunner(options: LaneRunnerOptions = {}): LaneRunner ``` Start a lane run. Throws, with every fault, on options `validateLaneRunner` (or runner-core) refuses. ### `laneBodyDefaults` ```ts const laneBodyDefaults: LaneBody ``` The body defaults. ### `laneRunnerPowerUps` ```ts const laneRunnerPowerUps: Record ``` The built-in power-ups: Subway Surfers' set. ### `subwayChunks` ```ts function subwayChunks(lanes = 3, options: { trainHeight?: number } = {}): RunnerChunk[] ``` Subway Surfers' track as chunks for any number of lanes: barriers to jump and roll, walls of trains with one lane open, ramps up onto roofs and runs along them, trains that come at the runner, coin runs and power-ups, harder ones further along. Every chunk starts with clear track, so the runner can reach any lane between chunks. ### `validateLaneRunner` ```ts function validateLaneRunner(options: LaneRunnerOptions = {}): string[] ``` Check a lane run's options and chunks. Empty when it can be run. ## Types ### `LaneAutopilot` ```ts interface LaneAutopilot ``` A player that picks the next move. - `next(): LaneMove[]` — The moves to make now (swipes, then a jump or a roll), empty to keep running. Call it before each step; it decides once every `every`. ### `LaneAutopilotOptions` ```ts interface LaneAutopilotOptions ``` How the autopilot looks ahead. - `horizon?: number` — Seconds a plan must live through. Default 1.5. - `beyond?: number` — Seconds it looks on past that, running straight, to choose between plans that live. Default 1. - `times?: number[]` — When a plan's jump or roll can come: now, or this many seconds later. Default `[0, 0.2, 0.4]`. - `every?: number` — Seconds of run between decisions; `next()` returns no moves in between. Default 0.1. ### `LaneBarrier` ```ts interface LaneBarrier ``` A barrier across a lane: the runner's body must pass above `top` or below `bottom`. - `kind: 'barrier'` — Marks this item as a barrier. - `lane: number` — Its lane. - `at: number` — Where it stands, from the chunk's start. - `bottom: number` — The height of its underside: a runner whose head is below it rolls under. - `top: number` — The height of its top: a runner whose feet are above it jumps over. - `look?: string` — What it is, for the drawing: 'hurdle', 'overhead', 'gate' or a game's own. - `hit?: 'crash' | 'stumble'` — What touching it does. Default `'crash'`. ### `LaneBarrierView` ```ts interface LaneBarrierView ``` A barrier, as drawn. - `id: string` — Unique id in the run: `:`. - `lane: number` — Its lane, from 0 on the left. - `x: number` — The x of its lane's middle, world units. - `z: number` — Where it stands along the run, world units. - `bottom: number` — The height of its underside, world units. - `top: number` — The height of its top, world units. - `look: string` — What it is, for the drawing: 'hurdle', 'overhead', 'gate', a game's own, or 'barrier' when the chunk says none. ### `LaneBody` ```ts interface LaneBody ``` The runner's body and moves. - `height: number` — Standing height. Default 1.8. - `rollHeight: number` — Height while rolling. Default 0.7. - `halfWidth: number` — Half its width. Default 0.3. - `halfDepth: number` — Half its depth along the run. Default 0.3. - `jumpHeight: number` — How high a jump goes. Default 1.4. - `jumpTime: number` — How long a jump is in the air, on the flat. Default 0.65 s. - `rollTime: number` — How long a roll lasts. Default 0.55 s. - `changeTime: number` — Seconds to move one lane across. Default 0.18. - `fastFall: number` — The speed a roll in the air drives the runner down at. Default 30. - `stepUp: number` — The height of an edge the runner steps up onto rather than hits (a ramp's start). Default 0.4. ### `LaneCoins` ```ts interface LaneCoins ``` A run of coins down a lane, straight or arched over something. - `kind: 'coins'` — Marks this item as a run of coins. - `lane: number` — Its lane. - `at: number` — Where the first coin is, from the chunk's start. - `count?: number` — How many. Default 1. - `every?: number` — The spacing. Default 3. - `y?: number` — The height of the first and last coin. Default 1. - `arc?: number` — How high the middle coins rise above that, in an arch. Default 0: straight. ### `LaneEvent` ```ts type LaneEvent = | RunnerEvent | { kind: 'jump' } | { kind: 'roll' } | { kind: 'land'; on: string | null } | { kind: 'bump'; side: -1 | 1 } | { kind: 'scrape'; id: string } | { kind: 'crash'; id: string; what: string } | { kind: 'pickup'; id: string; x: number; y: number; z: number; power?: string } | { kind: 'board' } ``` Something that happened in a lane run: runner-core's events, and the motor's own. ### `LaneItem` ```ts type LaneItem = LaneTrain | LaneBarrier | LaneCoins | LanePickup ``` What a lane chunk holds. ### `LaneMove` ```ts type LaneMove = 'left' | 'right' | 'jump' | 'roll' | 'board' ``` A move. ### `LanePickup` ```ts interface LanePickup ``` A power-up to pick up, by its name in the run's `powerUps`. - `kind: 'power'` — Marks this item as a power-up pickup. - `lane: number` — Its lane. - `at: number` — Where it is, from the chunk's start. - `power: string` — The power-up it starts. - `y?: number` — Its height. Default 1. ### `LaneRunner` ```ts interface LaneRunner ``` A lane run. - `readonly run: Runner` — runner-core's run under it: score, coins, speed, power-ups, stumbles. - `readonly state: LaneRunnerState` — Where the runner is. - `readonly options: Readonly<{ lanes: number; laneWidth: number; trainHeight: number; trainWidth: number; body: LaneBody; boardPower: string; coinRadius: number }>` — The options, defaults filled in. - `laneX(lane: number): number` — The x of a lane's middle. - `input(move: LaneMove): void` — A move, applied on the next step: swipes queue and turn back, jumps and rolls wait for the ground. - `step(dt: number): void` — Advance `dt` seconds, in fixed steps of 1/120 s. - `view(): LaneView` — What is where. - `drain(): LaneEvent[]` — Events since the last call. - `snapshot(): LaneRunnerSave` — The run as plain JSON. - `restore(save: LaneRunnerSave): void` — Pick up a saved run made with the same options. - `clone(): LaneRunner` — A separate run made with the same options, at the same point: to try moves on without touching this one. ### `LaneRunnerApi` ```ts interface LaneRunnerApi ``` What the `lane-runner-3d` pack adds to a game: `game.laneRunner`. - `create: typeof createLaneRunner` — Start a lane run. - `validate: typeof validateLaneRunner` — Check a lane run's options; empty when it can be run. - `chunks: typeof subwayChunks` — The built-in track as chunks, for any number of lanes. - `powerUps: typeof laneRunnerPowerUps` — The built-in power-ups. - `body: typeof laneBodyDefaults` — The runner's body defaults. - `autopilot: typeof createLaneAutopilot` — A player that looks ahead, for an attract mode or a test. ### `LaneRunnerOptions` ```ts interface LaneRunnerOptions ``` A lane run's options: the track, the body, and runner-core's run. - `lanes?: number` — How many lanes. Default 3. - `laneWidth?: number` — Their width. Default 2.6. - `startLane?: number` — The lane the runner starts in. Default the middle. - `trainHeight?: number` — A train's roof height, when a train does not say. Default 3.4. - `trainWidth?: number` — A train's width, as a fraction of the lane. Default 0.82. - `body?: Partial` — The runner's body and moves. - `chunks?: RunnerChunk[]` — The chunks the run is built from. Default `subwayChunks(lanes)`. - `opening?: string[]` — Chunk ids played first. Default `['runway']` with the built-in chunks, none otherwise. - `boards?: number` — Hoverboards in hand at the start. Default 3. - `boardPower?: string` — The power-up a hoverboard starts. Default `'hoverboard'`. - `powerUps?: Record` — The power-ups, by name. What each does comes from its definition: `shield` (a hoverboard), `multiplier` (a doubler), and the motor's `data`: `reach` pulls in coins that far ahead from every lane (a magnet), `fly` lifts the runner to that height over everything (a jetpack), `jump` is the jump height while it runs (super sneakers). Default `laneRunnerPowerUps`. - `coinRadius?: number` — How far from a coin's centre the runner picks it up. Default 0.9. - `run?: Omit, 'chunks' | 'opening' | 'powerUps' | 'hits'>` — runner-core's options for the run: seed, speed, stumbles, grace, score, milestone, ahead and behind. ### `LaneRunnerSave` ```ts interface LaneRunnerSave ``` A lane run saved as plain JSON. - `run: RunnerSave` — runner-core's saved run: score, speed, power-ups and the chunks laid. - `state: LaneRunnerState` — The runner's state. - `moving: [string, number][]` — The fronts of the moving trains, as [train id, front z in world units]. - `taken: string[]` — Ids of the coins and pickups already collected. - `struck: string[]` — Ids of the barriers and trains already struck, so each counts once. - `sky: [number, number][]` — The jetpack trail's coins still ahead, as [lane, z in world units]. ### `LaneRunnerState` ```ts interface LaneRunnerState ``` Where the runner is and what it is doing. - `x: number` — Across, in world units (0 is the middle of the track). - `y: number` — Height of its feet. - `z: number` — Along the run: runner-core's distance. - `vy: number` — Vertical speed. - `lane: number` — The lane it is in or heading for. - `from: number` — The lane it left, while it changes. - `grounded: boolean` — On something (the ground, a ramp or a roof). - `on: string | null` — What it stands on: a train's id, or null for the ground or the air. - `rolling: number` — Seconds of roll left. - `rollOnLand: boolean` — It will roll when it lands (a roll pressed in the air). - `flying: boolean` — Up on a jetpack. - `boards: number` — Hoverboards in hand. - `jumps: number` — Jumps, rolls and lane changes made. - `rolls: number` — Rolls made. - `changes: number` — Lane changes made. - `flights: number` — Jetpack flights taken. ### `LaneThingView` ```ts interface LaneThingView ``` A coin or a pickup, as drawn. - `id: string` — Unique id in the run: `:[:]`, or `sky::` for a jetpack coin. - `x: number` — Across, world units (0 is the middle of the track). - `y: number` — Height above the track, world units. - `z: number` — Along the run, world units. - `power?: string` — A pickup's power-up name; absent on a coin. ### `LaneTrain` ```ts interface LaneTrain ``` A train: a block a lane wide with a roof to run on, standing or coming at the runner, with a ramp up to it. - `kind: 'train'` — Marks this item as a train. - `lane: number` — Its lane, from 0 on the left. - `at: number` — Where its front is, from the chunk's start. For a moving train, where its front meets the runner. - `length: number` — How long it is. - `height?: number` — Its roof's height. Default the run's `trainHeight`. - `speed?: number` — Speed towards the runner, units a second. Default 0: standing. - `ramp?: number` — A ramp this long in front of it, up to the roof. Default none. ### `LaneTrainView` ```ts interface LaneTrainView ``` A train, as drawn. - `id: string` — Unique id in the run: `:`. - `lane: number` — Its lane, from 0 on the left. - `x: number` — The x of its lane's middle, world units. - `front: number` — Where its front is along the run, world units; a moving train's front closes on the runner. - `length: number` — How long it is, world units. - `height: number` — Its roof's height, world units. - `ramp: number` — The length of the ramp in front of it up to the roof; 0 for none. - `moving: boolean` — Whether it comes towards the runner rather than standing. ### `LaneView` ```ts interface LaneView ``` What is where, for a presenter. - `runner: LaneRunnerState & { height: number; board: boolean; speed: number }` — The runner. - `trains: LaneTrainView[]` — Trains from `behind` to `ahead`. - `barriers: LaneBarrierView[]` — Barriers. - `coins: LaneThingView[]` — Coins not yet taken, the jetpack's trail among them. - `pickups: LaneThingView[]` — Power-ups not yet taken. - `chaser: number` — How close the inspector is, 1 on the runner's heels to 0 gone. --- ## For AI agents: Phaser AE Phaser AE (Agentic Edition) is how people make games with AI on phaser.io. 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