Shiftlock
Slide a whole row. Shift a whole column. Put every number back in place.
Swipe a row or column, or use the arrows.
Slide a whole row. Shift a whole column. Put every number back in place.
Swipe a row or column, or use the arrows.
Shift any complete row one space left or right. Tiles wrap around the edge.
Shift any complete column one space up or down. There is no empty square.
Return every numbered rune to its matching position. Fewer moves earn a better record.
Some challenge boards may be impossible. Try solving one, or submit an impossibility verdict when you are ready.
For 3×3 and 5×5 boards, every legal row or column rotation is even. A sequence of legal moves stays even, while swapping exactly two tiles is odd. No search is needed: parity is a certificate of impossibility.