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Press Run. Three cells glow as bonus cells; as coins land, the ones that hit a bonus cell flash it active and land doubled.

Positional rules live in the game layer

The board reports where each coin landed; “this position is special” is your rule. The bonus cells are a Set of cell keys, drawn with the bonus_cell sprite, and the boost is a check in the lock handler:

board.events.on('coin:locked', ({ coin }) => {
  if (bonusCells.has(key(coin.cell))) {
    coin.data.value *= 2;                      // game rule: bonus cell doubles
    swapMarker(coin.cell, 'bonus_cell_active'); // flash + fade the marker
  }
  paintLabel(coin.cell, coin.data.value);
});

The markers ride board.container so they track the board, and they’re cleared the moment a coin claims the cell. Swap the rule for a ×N, a collector flag, or a jackpot tier per position — same hook.

Hold & Win: multiplier-strike coin. a multiplier that strikes the whole board
Hold & Win: upgrade a coin in place. promote a coin’s tier without a respin
Positional multiplier cells. fixed multiplier positions via pins on a standard reel set

Positional rules live in the game layer

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