At first sight this is an old good minesweeper game. At closer look, this is a sample use of a revolutionary technology that allows you to use Java to code your application logic and present it using HTML on any device providing modern HTML5 browser.
Discover ten square fields that contain a mine and mark them with a ⚠ sign. Touch a square to find out if there is a mine or not and how many mines are in the eight surrounding ones. Avoid random play, the game recognizes guessing and can re-arrange the mines. This game is fair!
In case you want to write application like this (e.g. use Java and HTML) you can learn more about the libraries that make that possible. Follow this link to HTML for Java documentation.
One can package this application as a plugin for NetBeans or use NetBeans IDE to create application like this yourself. Enjoy the power of HTML and Java. Write your applications once and deploy and display them on any device!