Which is the hardest game in Alice in Borderland?

I'm curious, out of all the games featured in the thrilling series Alice in Borderland, which one do you think poses the greatest challenge to the players? Is it the game of hearts that tests their emotional resilience, the deathly maze where every step could be their last, or perhaps the game of chance that relies heavily on luck? Each game seems to have its own unique set of obstacles, but which one do you believe stands out as the most difficult to conquer?