Bubble Rune Parade

Pop both rune bubbles within seven swaps. Swap neighboring runes to make horizontal or vertical lines of at least four identical letters. A bubble loses one shell only when a neighboring matched line has the color shown on that shell. The central bubble needs A then B; after its first shell pops, it rises one square if the space above was cleared. The other bubble needs C. A bubble can lose only one shell per swap, even when several lines clear together. Matched runes disappear without refill, so save the second layer’s color until the bubble rises. One Undo restores the last swap for a different attempt. Keyboard: Tab and Enter/Space operate buttons; R restarts.