Rnfl qrpelcgvba punyyratr: MrRubix's 10-stage Crypto Challenge. New riddle each day.

[MrRubix]

It isn't random if you pay attention to what the cipher looks like.

The whole point of cryptography is to rationalize out patterns.

Like Emerald said, the numbers are almost a dead giveaway. Even if you had no idea how to do #2, there is a well known approach you could apply to the first sentence, and that sentence would help you get the rest -- the numbers too are a dead giveaway, especially when compared to the other sentences.


tldr: Learn to problemsolve :P