Duck Games has a very popular game called Flow on other platforms. As far as I can tell Flow by Ivy Studio is a very close replica/knockoff of that game with 600+ levels of puzzles to solve through. Essentially you must match and connect the colors with a pipe by covering the whole board and not intersecting another pipe. It starts out easy and gets difficult very quickly.
Check out Flow for $1.99 in App World for both the PlayBook and BlackBerry smartphones
PS: You can play an HTML5 version of this game on the PlayBook browser free at this link