I made my first normal console game in C ++ here. This is a simple game. The game is also known as Concentration, Pelmanism, Shinkei-suijaku, Pexeso and Pairs. This is a simple console implementation of this game. There are 3 levels: easy, normal and difficult. Also after the game, statistics are displayed (for how many moves you completed the level).
I tried to use STL and object-oriented programming. Therefore, first of all, I would like to know how to improve in this. I would also like to know how clean and clear my code is. I would be very grateful for all the tips!