Words of Wonders: Guru is a curious word game where you have to complete crossword puzzles to progress. The game mechanics are simple since you just have to join the letters in the correct order to form a word.
With each round of tests you win, you'll unlock three things: The first is a photo of well-known sites in the world's most touristic countries, such as Spain, Greece or Egypt. The second is information about the photo's contents, such as the Sphinx of Giza. The third is gems, which can help you in the game through hints.
If you use 100 gems, the game will suggest where you can place letters if you're stuck. However, although the game's difficulty increases through the use of longer and more unusual words, it's unlikely that you'll need to use the hints very often. And even if you do ever need them, you'll earn more than enough gems as you progress through the game.
If you want a fun crossword game for practicing and learning words, then downloading the Words of Wonders: Guru APK is a good idea. You can even change the language to learn words and practice your fluency in another language.