GoStars app for iPhone and iPad

GoStars is an abstract strategy board game similar to Gobang, Gomoku, 五子棋, 五目並べ, 오목(五目) Connect 5 or 5-in-row. It is played by two players who alternately place black and white stones on the vacant intersections of a grid of 19x19 lines. Whoever lines up 5 pieces in row horizontally, vertically or diagonally wins the game and gets five stars. Generally, whoever moves first is likely to win the game. The rule is simple, however, its very challenging if your opponent is sophisticated in her or his strategies.
In GoStars, you play it against the computer. There are nine levels measuring your skill. From level 1 to 5, you move first; from level 6 to 9, computer moves first. Initially all the levels are locked except level 1. The new level is automatically unlocked if you win the game on the current level.