Puzzle Brainiak is a collection of 4 single-player puzzles games: Slitherlink, Towers, Untangle and Knight. - Slitherlink: Form a single closed loop out of the grid edges, in such a way that every numbered square has exactly that many of its edges included in the loop. - Towers: Fill in the grid with towers whose heights range from 1 to the grid size, so that every possible height appears exactly once in each row and column, and so that each clue around the edge counts the number of towers that are visible when looking into the grid from that direction. - Untangle: Move the points around so that none of the lines cross. - Knight: switch colors by moving pawns to the opposite side of the board.