What is the hardest quarter to get?

I'm curious, what do you mean by the 'hardest quarter to get'? Are you referring to a specific type of coin or cryptocurrency? Is it a rare collector's item, or is there a particular challenge associated with acquiring it? Perhaps it's a token that's difficult to mine, or one that's highly sought after due to its limited supply? I'd love to hear more about what makes this quarter so difficult to obtain and why it stands out among others in the cryptocurrency or numismatic world.