Layers push up on each Shift — and matches only clear during a Shift, after everything rises. So take your time between Shifts: slide rows to line up big groups of one color, drop to compact your stack, then let the rise resolve it all for a chain. You lose if a filled cell is pushed past the top. tap / click L·R half slide that row ↓ / DROP compact ↑ / space / PUSH UP rise & resolve · W S pick · ← → slide (desktop)