Sixto - Locked

When using the Sixto: Locked expansion score pad, you're still trying to mark off as many spaces in a row or column as possible, but each colored row now features three locked spaces — and you can't mark off a space to the right of a lock until the locked space is itself marked off. Don't want to wait forever for the proper numbers to be rolled? On a turn, you can cross off the next locked space in a row if you mark off no other spaces on your score sheet. Will that cost be worth it?