Flow Free

Flow Free is a puzzle game developed by Big Duck Games and released for iOS on June 7, 2012. The game was shortly ported to the Windows Mobile platform and an Android version is currently in production. The game is played on a grid, where the player must connect different colored circles to fill in every square. The colored lines created by dragging from one circle to another cannot cross other lines, so the challenge is to work out a path for each color only knowing the starting and ending points. Difficulty increases with larger grids, ranging from the 5×5 easy grids to the difficult 15×15 ones.