Very similar to minesweeper, except mistakes cost you money. How far can you get while keeping all your funds?
Fields and Flags plays very much like minesweeper. The difference is that you start with a bunch of money and if you make a mistake it just costs you money, rather than ending the game.
Another difference is that you don't get long to decide which squares are potentially mines or not. After a short time the grid will start revealing itself anyway, so you need to stay one-step ahead. Which is definitely easier on the smaller levels, and much harder on the bigger ones!