In level F5, lesson 28, is the phrase:

"Do (you) have any adventure book?"

which Fluez translates as "Tiene algún libro de aventuras?" and will not accept "Tiene cualquier libro de aventuras". Wondering when to use 'cualquier' and when to use 'algún' as, according to my notes, they both meany "any".

Thank you for checking this out for me. No matter how many times I played it, I could only hear what I heard, which was incorrect. I followed up on it today and cannot hear it incorrectly. Sometimes it helps to move along and come back later. That idea is the more important take away for me with this little adventure. It's a very common occurrence for me while listening to music as well.

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Thanks for that.