The mechanic
A “big symbol” is one ReelSymbol that spans an N x M block of cells. The
server only writes its id at the anchor (top-left) cell; the engine paints
the rest of the block with OCCUPIED stubs that downstream code resolves
back to the anchor’s symbol id.
.symbolData({
bigWild: { size: { w: 2, h: 2 }, weight: 0, zIndex: 5 },
})Big symbols must have weight 0 - they’re never randomly filled, only
placed by the server in setResult(). The engine throws at build time if
you give one a positive weight.
Win animation
The card’s playWin animates only the glyph, not the view. The card
border stays still while the character scales, wobbles, and flashes warm
gold. This matters here: a 2x2 BIG WILD covers 4 cells; if playWin
moved the view it would jitter four times in the same physical sprite.
Round flow
roundBus.emit('round:reset')- clears the WinBox.reelSet.spin()+setResult(grid)- mock server lands a fresh grid.- Left-anchored payline evaluation - 3+ consecutive matches per row, with wild + bigWild substitution.
WinPresenter.show(wins)- dims losers, cycles each win twice with a 60ms cell stagger.roundBus.emit('win:set', total)- WinBox tickups to the total.