What i think the explanation to the riddle on Chapter 12 is: I believe that, although the anwser can be found without Liza's help, it is difficult enough that most players will have to use her advice.Now how was Liza able to solve the puzzle though,when no one else could?My thinking is that she simply didn't.Her father is rich and powerful, so she could have easily relayed the information of the puzzle to him and let him or someone who works for him solve it.This also explains why she didn't want to explain how she solved it.
i like endless war 5-6-7 but i wish they would make endless war 8(if they make it) like this again,or at least make an endless war custom battle where you could make your own map.
This game is very much work in progress and many features have not been added, thanks for the feedback.