Continuous Challenge Use your 5th Grade problem-solving skills to stop the villainous Dr. X from destroying the city! Pack extreme fun and exciting adventure into learning while you search out the clues, unlock secret codes, and expose the villain's menacing plan. Master over 25 skills in Math, Reading, History, Science, and more! Reading Comprehension Addition, Subtraction, Multiplication, & Division Geometry, Fractions, & Decimals Environmental Science Art History & Appreciation The online services advertised as part of this product may be changed or discontinued at any time, at the discretion of the manufacturer.