Thank you for feedback.
I guess, this is the hardest thing in puzzles gamedesing, and something I completly failed at: not to underastimate difficulty. Since I know meaning of all "burumbos" (I've made them up, duh), thought process behind all puzzles was very clear for me. I should have spent more time explaining it, or, at least, made puzzles more straightforward.
Idea behind stages with new words but without provided answers was that you can deduce the meaning of unknown words based on known ones. Now I understand that I've probobly failed at communicating that :)
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Got it. I'm ok(actually I like this idea) that new words can be deduced, but I'd like to know the detailed result of the new words(update in the book too), so I can keep going based on those. Otherwise if I deduced incorrectly, I'll keep deducing more and more wrong answer...
Also I'm not sure if the deduced answer is the only answer. I remember I deduced the word but the result was not correct... Maybe I made a mistake but again if the result can be shown to player, they can have more idea what they did wrong and how to improve for next question.