Made of little things.

export const WIDTH = 18,
  HEIGHT = 12;
export const MATERIALS = [
  { name: 'Air', color: '#ffffff' },
  { name: 'Meadow', color: '#8ac987' },
  { name: 'Pebble', color: '#b9a4cd' },
  { name: 'Timber', color: '#dfb277' },
  { name: 'Coral', color: '#f58d92' },
  { name: 'Glacier', color: '#8bd5e5' },
  { name: 'Butter', color: '#f2d58b' },
];
export type World = {
  name: string;
  blocks: number[];
  edits: number;
  locked: boolean;
};
export const cell = (x: number, y: number, z: number) =>
  x + z * WIDTH + y * WIDTH * WIDTH;
export function top(world: World, x: number, z: number) {
  for (let y = HEIGHT - 1; y >= 0; y--)
    if (world.blocks[cell(x, y, z)]) return y;
  return -1;
}
export function practiceWorld(): World {
  const blocks = Array(WIDTH * WIDTH * HEIGHT).fill(0),
    put = (x: number, y: number, z: number, b: number) =>
      (blocks[cell(x, y, z)] = b);
  for (let x = 0; x < 18; x++)
    for (let z = 0; z < 18; z++) {
      put(x, 0, z, 2);
      put(x, 1, z, 2);
      put(x, 2, z, x < 2 || z < 2 || x > 15 || z > 15 ? 6 : 1);
      if (x > 12 && z < 6) put(x, 3, z, 1);
    }
  for (const [x, z] of [
    [3, 4],
    [13, 12],
    [5, 14],
  ]) {
    put(x, 3, z, 3);
    put(x, 4, z, 3);
    for (let dx = -1; dx <= 1; dx++)
      for (let dz = -1; dz <= 1; dz++) put(x + dx, 5, z + dz, 1);
    put(x, 6, z, 1);
  }
  for (let x = 8; x <= 11; x++) for (let z = 3; z <= 6; z++) put(x, 3, z, 3);
  for (const [x, z] of [
    [8, 3],
    [11, 3],
    [8, 6],
    [11, 6],
  ]) {
    put(x, 4, z, 4);
    put(x, 5, z, 4);
  }
  for (let x = 8; x <= 11; x++) for (let z = 3; z <= 6; z++) put(x, 6, z, 5);
  return { name: 'Practice island', blocks, edits: 0, locked: false };
}
export type Gardener = { x: number; z: number; color: number; name: string };
export type Peer = Gardener & {
  tx: number;
  tz: number;
  seen: number;
  seq: number;
};
export const PLAYER_COLORS = [
  '#f07891',
  '#75bfe0',
  '#b799ed',
  '#efba68',
  '#85c8a7',
  '#ee98ca',
];