Today I finished all the core of the game:

• Added hidding of mines already flagged when the player loses.
• Added detection of winning and display a 'You Won' text.
• Added release of the old map system references when the game is restarted.
• Added set of the window size according to the grid size so the game looks good for any grid size.
• Added scalling of the font instead of scalling each print, so we got well defined strings printed.

Now that the base of the game is done, next days I will be focusing in usability and features to improve the gameplay.