over 35 million downloads! the only thing you need to do is to “bump two balls.” will you be able to clear these simple-looking but actually difficult stages? ▼ the rules are simple! ◆ let's bump the two balls all you need to do to clear a stage is to “make the blue and red balls bump”. draw lines and shapes freely to move and roll the balls. flexible thinking is going to become the key to victory. ◆ let's collect pens starting off with a simple pencil, moving onto color pencils, crayons and so on. we have prepared more than 25 varieties of pens of different colors and sizes. collect various pens and walk through the stages. ◆ share the moment of victory you can review the moment you cleared a stage on video or picture. share it on sns to show off your superior skills to your friend