luck card game

A Cultivation style lucky card game, with a variety of challenges mode
Simple mode
At the beginning of the game, the system gives a memory card for 3 seconds and turns all pairs of cards open within 15 seconds
Normal mode
At the beginning of the game, the system gives a memory card for 2 seconds, turns all pairs of cards within 13 seconds to clear the pass, one of the 6 pairs of cards is a black card, and a point of opening a black card fails
Difficulty mode
At the beginning of the game, the system gives a memory card for 1.5 seconds, turns all pairs of cards within 10 seconds to clear the pass, and two of the 6 pairs of cards are black
Free mode
No memory time, no black card, 20 seconds to complete the game considered successful...