Smiley faceπ: Click it if you want to reset the game
It is not necessarily to mark all mines to win the game. As long as all safe blocks are clicked, you will win.
Numbers on top 45: left one indicates the time used for this game and will be recorded if it is good enough.
The right one indicates how many mines left to be swept.
Difficulty : Select the difficulty you want before a new game starts.
Advanced trick: For a number block, if you have already marked a number of flags equals to the number block value,
then click on the number block, and we will automatically step on all the other surrounding unknown blocks.
If the surrounding unknown block amount equals to the number block value, we will automatically put flags on all those blocks.
Be careful using this trick because you will get punished after you click a number block and nothing happens for a few times!