2 questions about the game, anyone can help?

[Thinker]

Thanks for all your prompt replies.

[kentuequi]

1, in the challenge screen, is it true that player1 started first in the game, and player2 is second? if not what is the meaning of player 1 and player2?

Player 1 is the one who create the game, player two is the one who join the game. You can be player two and go first in game.