This game is very simple but it will test your brain power and sharpen your mind. Your aim is to fill the blocks with a single line. You need to be extremely sharp and careful to avoid erasing the wrong blocks. 

Fill is a simple but addictive one-line puzzle game that’s completely free to play! You will never stop playing it once you download it, no matter how challenging it is.

It's not a huge surprise that people love to play this kind of puzzle games. The one-line blocks are so easy to fill that anyone can play it, no matter if you’re a beginner or a master.