What is the Mate in 3-4 (Chess Puzzles) game, how does it work?

According to the introduction of Chess King, Mate in 3-4 (Chess Puzzles) is a Board game on the Android platform. There is currently a 1.2.1 version released on Dec 04, 2018, you can see the details below.

This course includes more than 2500 exercises for mating in 3 or 4 moves. You will have to use your fantasy and precise calculation in order to find a correct way of attacking the king. After going through this course you are sure to improve your skills and abilities considerably and will not miss an opportunity to employ a nice little combination in a practical game of your own. The program is intended both for club players and intermediate players. All the exercises are taken from practical games and arranged according to the names of pieces and difficulty levels.

This course is in the series Chess King Learn (https://learn.chessking.com/), which is an unprecedented chess teaching method. In the series are included courses in tactics, strategy, openings, middlegame, and endgame, split by levels from beginners to experienced players, and even professional players.

With the help of this course, you can improve your chess knowledge, learn new tactical tricks and combinations, and consolidate the acquired knowledge into practice.

The program acts as a coach who gives tasks to solve and helps to solve them if you get stuck. It will give you hints, explanations and show you even striking refutation of the mistakes you might make.

Advantages of the program:
♔ High quality examples, all double-checked for correctness
♔ You need to enter all key moves, required by the teacher
♔ Different levels of complexity of the tasks
♔ Various goals, which need to be reached in the problems
♔ The program gives hint if an error is made
♔ For typical mistaken moves, the refutation is shown
♔ You can play out any position of the tasks against the computer
♔ Structured table of contents
♔ The program monitors the change in the rating (ELO) of the player during the learning process
♔ Test mode with flexible settings
♔ Possibility to bookmark favorite exercises
♔ The application is adapted to the bigger screen of a tablet
♔ The application does not require an internet connection
♔ You can link the app to a free Chess King account and solve one course from several devices on Android, iOS and Web at the same time

The course includes a free part, in which you can test the program. Lessons offered in the free version are fully functional. They allow you to test the application in real world conditions before releasing the following topics:
1. King + queen
2. King + rook
3. King + bishop
4. King + knight
5. King + pawn
6. Queen
6.1. Level 2
6.2. Level 3
6.3. Level 4
6.4. Level 5
6.5. Level 6
7. Queen + rook
7.1. Level 3
7.2. Level 4
7.3. Level 5
7.4. Level 6
7.5. Level 7
8. Queen + bishop
8.1. Volume 1
8.2. Volume 2
9. Queen + knight
9.1. Volume 1
9.2. Volume 2
10. Queen + pawn
11. Rook
11.1. Level 2
11.2. Level 3
11.3. Level 4
11.4. Level 5
11.5. Level 6
11.6. Level 7
12. Rook + bishop
13. Rook + knight
13.1. Volume 1
13.2. Volume 2
14. Rook + pawn
15. Bishop
16. Bishop + knight
17. Bishop + pawn
18. Knight
19. Knight + pawn
20. Pawn
21. Any piece checkmates
21.1. Level 2
21.2. Level 3
21.3. Level 4
21.4. Level 5
21.5. Level 6
21.6. Level 7
21.7. Level 8
21.8. Level 9
21.9. Level 10

What's new in version 1.2.1 * Chess King app released! Now you can study all courses within one app! The app provides subscriptions to all courses.
* Added Arabic, Indonesian, Filipino and Vietnamese translations
* Added night mode
* Added option to disable popup ads for 1 hour
* Added "Make current move" button in engine analysis mode
* Theory exercises are now marked as read after 3 seconds
* Fixed display issue on Android 8 in landscape mode
* Improved engine mode
* Various fixes and improvements