Press Run repeatedly — watch the wild march one column left each spin until it exits off the board.

The walking wild doesn’t live in the library — it’s a result-construction pattern. Each respin, you inject the wild at a fixed row but a different column, then decrement.

// Game state outside the ReelSet
let walker: { reel: number; row: number; symbolId: string } | null = null;

async function playSpin() {
  const promise = reelSet.spin();

  // If a walking wild is active, force its position into the result grid
  const rawResult = await serverSpin();    // your mock or real server
  const grid = rawResult.symbols;
  if (walker) {
    grid[walker.reel][walker.row] = walker.symbolId;
  }

  reelSet.setResult(grid);
  await promise;

  // Pays: evaluate the grid with walker in place (same rules as normal)

  // Progress the walker
  if (walker) {
    walker.reel -= 1;
    if (walker.reel < 0) {
      walker = null;                       // exited the board — round over
    } else {
      // Not done — queue an auto-respin
      setTimeout(playSpin, 600);
    }
  } else {
    // Did this spin SUMMON a walker? (e.g. any landed wild at column 4)
    const lastCol = grid.length - 1;
    const wildRow = grid[lastCol].findIndex((s) => s === 'wild');
    if (wildRow >= 0) {
      walker = { reel: lastCol, row: wildRow, symbolId: 'wild' };
      setTimeout(playSpin, 600);
    }
  }
}

What makes this feel good

Same wild = same row across the walk. Players read the migration as “my wild is coming”.
Auto-respin between steps. The walker isn’t an instant teleport — it’s a new spin with the wild pinned to its new column. Use setStopDelays on the column the wild will land to emphasize it:
```
reelSet.setStopDelays([100, 200, 300, 400, 1200]); // long pause on reel 4 if walker is landing there
```
Don’t forget the exit. Once the walker steps off column 0, clear it. Dramatic finale: a win spotlight on the path it walked.

Variations

Multiple walkers — store an array; every respin all walkers shift; a fresh wild becomes the newest walker.
Column jumps — walker jumps column randomly (+/-1, +/-2) instead of always -1.
Row drift — walker also drifts row by ±1 each step for a “wandering” feel.

Sticky wild — wild stays in place across respins (no walking)
Single-reel respin — hold the reel the wild is on and respin the rest
Anticipate a reel — slow the column the walker is about to land on

What makes this feel good

Variations

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