I love this game, and sometimes I play it in the middle of the night when I cant sleep. I would like the flashing arrow to be red, because its so subtle I can barely see it. (That would make it five stars) For those of you who are new, when you clear a number, it does not show up again until the next game. When you click the arrow to add more numbers, it only adds the numbers that are already there, in their exact order, without the spaces. The game does not end unless you win! I usually dont go past one screen full of numbers. If that happens, I start a new game.