[splike]

I had assumed that the AR side of the problem would be the easy bit and that the real issue would be solving the riddles.

[yeldarb]

I think that bit would be easy; but I'd probably cheat. You don't need to understand the context of the clues. You just need a big enough wordlist to brute force with. Start with the longest words since they will have the least options.

I'll bet you could scrape all the previously used words/phrases from the last 100 years of NYTimes, etc to get things rolling.

[splike]

I think a word2vec guided brute force approach to the riddles would be the winning combination.

[Tenobrus]

Check out Dr. Fill and maybe Cruciform.