It

Some people are saying they cant right click. As it says above (in the second screenshot) you can use CNTRL+CLICK instead of a right click. In case you were wondering, this is standard for most applications.
Others are saying that you cant play intermediate or expert levels. This is not a glitch, it is a restriction. This is the free version of a $.99 app called "Minesweeper!" which is listed on the right side of the page under "Other games by Ross Franklin". Granted, it would be nice if that was made clear in the pictures above.
Other than this, it is simple, and works well. Nothing fancy, its just minesweeper.

mikefdorst about Minesweeper 101