George Weiss's game challenges the player to spell five words as quickly as possible using 20 letters stacked in a pyramid shape. He's selling it for 99c.
The app is based on a board game, which went on sale earlier this year.
Weiss has been inventing for over 50 years, but Dabble is his first invention to come to market. Developers at Flashy Substance and Itch helped him create the app.