Blocknado keeps the falling pieces but throws out the row-clearing floor: a single glowing block sits at the center of the board and everything else stacks up in rings around it. Slam a piece down and the whole structure cranks a quarter-turn, so the wall you built on one side swings around to meet you from a new angle. Complete a ring and it collapses inward, often triggering the next ring too. Free on iOS and Android.