To fix the lag in the shop, Please click the "Get free" button on the lower-right corner, Then close the window and the lag will be gone.
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I have beaten all levels in Hard mode without using the Walkthough except level 29, However I used it 5 times in the Medium mode though. What does it means...
Of course! Kana Warrior is a game intended for learning Japanese, so the typing part of it is really easy if you are a Japanese speaker :P