A stone matrix floats over storm clouds, its cells outlined by electric arcs. Pick one of five irregular rune stones, then place it in an empty cell. Matching a rune in the same row, column, or color ring sparks a fatal conflict. Clean fills score; streaks build an arc combo. Timed cells lock empty for no points. An orange capsule clears your selection. Later boards leave fewer blanks under tighter clocks, with planted decoys that punish careless taps and reward quick pattern reading.
Tap runes on crumbling arc grid; no repeat rows, columns, color rings.