Fourder ( https://play.google.com/store/apps/d...ercode.fourder ) is perfect for playing when you have a few spare minutes. It's based on a very simple concept. You start off with a blank board and a goalboard. In each phase of the puzzle, you get a phasenumber. By clicking one of the arrows along the sides of the gameboard, you "feed" this number to the board. If a cell already contains a number, the phasenumber will be added to it. A number-feed will stop when it encounters a wall. The goal of the game is to have your gameboard end up containing the same setup as the goalboard.
Think ahead, throw in some logic. There is no trial-and-error. Solving enough puzzles on lower difficulty levels will unlock more challenging puzzles.
Re: [FREE] Fourder
Interesting idea. Thanks for sharing. Hope it does well in Play.