It's time to test your vocabulary with Ninja Crossword Challenge, an educational puzzle online game for everyone, and a free game for kids to improve their vocabulary. All you have to do is fill in the words in the grid, the game has more vocabulary than you can imagine, ready to take on my challenge? Ninja Crossword Challenge,vocabulary,puzzle,kids,online game,educational puzzle,word game,brain training,fun,Android,boys,brain,HTML5,kids games,word,puzzle,online,game,challenge