Oxygen Games today announced that Challenge Me: Brain Puzzles and Challenge Me: Maths Workout are now available, exclusively for Nintedo DS. Challenge Me: Brain Puzzles includes a thousand puzzles of all challenge levels, and two of the most popular number based puzzles, Sudoku & Picture Logic. Challenge Me: Maths Workout includes two puzzle games: Hidden Logic! and Formulate!. Check full article for details and click on both games names for new screenshots.