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Arena rooms

Free packv3.0.0-12DArcade

Seeded rooms for top-down action games: a walled grid with obstacles, a start, an exit and every open cell reachable. And the movement such rooms need, so enemies find their way round walls and the player slides along them.

This is a Free pack. Every phaser.io account can use it in their games.

Released October 19, 2026

Arena rooms: a screenshot of its demo
A note about these graphics

Expansion packs don't come with graphics. This screenshot is one way of drawing what the pack does, made for its demo: none of the sprites, tiles or backgrounds in it are in the pack.

That's by design. A pack is a game's logic, mechanics and effects, and it works with whatever art you give it. Some packs draw effects, backdrops or 3D scenes of their own, but none carries a game's sprites.

So the look is yours. Make the art on phaser.io, bring your own, or let your agent draw it in code: the same pack can look like anything.

What it does

generateArena builds a room from a seed. It sizes a walled grid, places obstacles in one of five styles, puts the start and the exit at a side, the centre or a cell you name, and keeps a clear space round each. Any obstacle that would cut an open cell off from the start is dropped, so the whole room is always connected, and the layout comes with a shortest route from the start to the exit. Options it refuses produce every fault at once, and validateArena lists them without throwing, which suits an editor or a settings screen.

The layout is plain data: the wall rectangles to draw, the blocked cells, the centre of every open cell, the start, the exit and the route. The movement helpers work on it directly. arenaField builds a flow field towards a goal, so every open cell knows the way round the walls, and arenaSteer gives a unit direction towards the next cell's centre, so a round body clears corners instead of cutting them. A crowd of enemies can share one field.

moveInArena moves a circle and slides it along walls, slipping round a corner it only clips, as players expect, rather than stopping dead. circleFree tests a circle against the walls, lineClear walks the cells a segment crosses to say whether a shot gets through without cutting a corner, and arenaSpawns picks open cells a set distance from the start in a seeded order.

Features

  • Seeded rooms — any size from 7 by 8 cells up to 200 by 200, with the cell size in world units.
  • Five obstacle styles — pillars, courtyards, barricades, ruins and galleries, picked by seed or by name.
  • Always connected — obstacles that would isolate any open cell are left out, and a start-to-exit route is returned.
  • Start and exit placement — top, bottom, centre or a cell, with adjustable clearance round each.
  • Flow fields — arenaField towards any point, with arenaSteer for bodies of real size.
  • Wall sliding — moveInArena slides along walls and slips round clipped corners.
  • Shot and body tests — lineClear for shots, circleFree for bodies, isBlocked for cells.
  • Spawn points — arenaSpawns picks seeded open cells away from the start.
  • Validation — validateArena lists every fault in a set of options.

Good for

  • Room-by-room action games in the style of Archero, with a door that leads to the next room.
  • Twin-stick shooters, where crowds of enemies flow round obstacles towards the player.
  • Survivor-style arenas, with spawn points kept away from where the player starts.
  • Stealth levels, with walls to hide behind and line tests for sight and shots.
  • Roguelite runs, where every room is new but reproducible from its seed.

Make it yours

generateArena takes the seed, the columns and rows as a number or a range, the cell size, the style, how many obstacles to try, where the start and exit go, and how much clear space to keep round each. The movement helpers take the body's radius and, for wall sliding, how much of a corner a body may clip and still slip round it.

Two materially different uses: a tight early room of 12 by 16 cells in the pillars style with a handful of obstacles, the start at the bottom and the exit at the top; and a large open arena of 40 by 40 cells in the ruins style, the player starting in the centre and spawn points picked far from them, for a survivors game.

A quick look

A seeded room, and enemies that flow towards the hero round its walls:

const room = generateArena({ seed: 12, style: 'ruins', start: 'bottom', exit: 'top' });
const toHero = arenaField(room, hero);
for (const e of enemies) {
    const v = arenaSteer(toHero, e, room.cell);
    moveInArena(room, e, v.x * e.speed * dt, v.y * e.speed * dt, e.radius);
}

Works with

  • nav — its flow field is what arenaField builds; use it directly for a grid of your own.
  • visibility-2d — for line of sight round walls.
  • room-run and stealth — game rules that stand on these rooms.
  • arena — for a playfield's edges and shape, such as wrapping or bouncing.
  • tiles-2d — for tile maps you design yourself.

Good to know

  • An obstacle that would cut the room in two is left out, so a room may hold fewer obstacles than asked.
  • Rooms are grids, so walls are whole cells, and bodies are circles.
  • A flow field is rebuilt by calling arenaField; for a goal that moves every step, rebuild it a few times a second rather than every step.
  • The pack draws nothing; your game draws the walls from the layout.

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