Users need to choose 1 skill card from the 3 cards randomly given by the system to the users, and choose a total of 24 cards as their basic deck. Use this completely random deck to compete with other users in 1V1 battles. Each time the user wins, a certain number of challenge mode points will be accumulated. If the user has played 7 games or failed 3 games in the challenge mode, the challenge is considered to have failed. The user can keep his points and return to the home screen, or pay the entrance fee for another challenge.