Pentango 1.2 (Mobile)
Source: LogicWeave Software
From the developer: "Tired of solitaire on your PC? Looking for something a little more challenging to pass the time? Pentango is a fast paced board game which is as easy to learn as tic-tac-toe yet offers challenging play for both kids and adults. Pentango offers three variations of GoMoku in which players try to get 5 pieces in a row on a 19x19 grid. Variations allow capture of pieces (also known as Pente). Pentango has many features including unlimited undo/redo, hints, 4 levels of play (including the very forgiving kids mode) and sound effects."