Fill is a free, one-line puzzle game. The goal is to fill in all the blocks using only one line. Each level contains at least three, and sometimes as many as four blocks. At the beginning of each level, you will be given a number of hints, which you can use to help you in solving the puzzle.

This is a great game for those times when you need a quick burst of mental activity. It also helps you learn how to solve math problems, which can be really challenging. Math puzzles are also a great way to relax, and you can use them as a game to take your mind off of other things.