Memory Game - Flags country

In the game there is a field with inverted cards, on the reverse side of which various Flags country are depicted. Clicking on the cards, they open one at a time, and then turn over again.
Remembering what kind of "Flags country" category there is depicted, you need to find the same "Flags country" category among the other cards. After that cards with the same "Flags country" category remain open and then disappear from the field.

The game has 3 levels of difficulty:
1. Easy (field 2x3)
2. Medium (field 3x4)
2. Complex (field 4x5).
And also there is a level where you need to find a couple of all the "Flags country" category for a while.

GOOD LUCK AND GOOD HAPPY!