Controls:
The controls in Hardest Chess - Offline Chess are very easy to learn. Simply click on the piece you want to move and then click on the square where you want to move it. If the move is valid, the piece will move to the selected square. If the move is not valid, the game will display an error message.

When you click on a piece, all the squares it can move to will be highlighted in green. You can click on any of these squares to move the piece to that square. If you want to cancel a move, you can click on the 'Undo' button at the bottom of the screen.

Difficulty Levels:
There are four difficulty levels in Hardest Chess - Offline Chess: Easy, Medium, Hard, and Hardest. The AI opponents are very challenging, even at the easy level, so you should be prepared to face some tough opponents.

At the easy level, the AI opponent makes random moves and does not use any strategy or planning. At the medium level, the opponent starts to use basic tactics and planning. The hard level is very challenging, and the opponent uses advanced tactics and strategies. The Hardest level is the ultimate challenge, and the opponent uses the most complex tactics and strategies.

The AI opponents in Hardest Chess - Offline Chess are very intelligent and use machine learning algorithms to improve their gameplay. So, the more you play, the smarter the opponents become.

Tips and Tricks:
Here are some tips and tricks to help you improve your gameplay in Hardest Chess - Offline Chess:

1. Plan your moves carefully and think ahead. Try to anticipate your opponent's moves and plan your moves accordingly.

2. Always prioritize defending your king. The goal of the game is to capture the opponent's king, but you should never sacrifice your king to do so.

3. Use your pawns wisely. Pawns are the weakest piece on the board, but they can also be very useful for blocking your opponent's moves and creating a defensive barrier.

4. Control the center of the board. The squares in the center of the board are the most important, as they give you more mobility and allow you to attack from different angles.

5. Use your pieces together. You can create powerful combinations by using your pieces together. For example, you can use your knight to attack a piece while your bishop covers its escape route.

Conclusion:
Hardest Chess - Offline Chess is an excellent chess game that offers a challenging gameplay experience. With its advanced AI opponents and intuitive gameplay controls, this game is suitable for both novice and experienced players alike. Use the tips and tricks provided above to improve your gameplay. So, what are you waiting for? Download Hardest Chess - Offline Chess today and start playing!