"The excitement the entire concept held for my fourth grader was wonderful as he excitedly completed problems in order to solve the riddle."
Also see reviews at:

www.smartappsforkids.com (5 stars)
"New Top Pick: Math Galaxy Fraction and Decimal Riddles is a fun way to reinforce math skills."
https://web.archive.org/web/20170211060150/http://www.smartappsforkids.com/2016/10/new-top-pick-math-galaxy-fraction-and-decimal-riddles-is-a-fun-way-to-reinforce-math-skills.html#more

and

http://www.bestappsforkids.com/2016/math-galaxy-fraction-decimal-riddles-2/

Math Galaxy Fraction and Decimal Riddles is a game like Wheel-of-Fortune, with the answers to math problems as clues to riddles and word jumbles. There are 500 riddles and 600 word jumbles with definitions. Riddles and jumbles are chosen randomly. Numbers for math problems are created randomly and cover fraction operations (fraction pies, fractions on a line, add, subtract, multiply, divide), decimal operations, and measurement (which includes adding, subtracting, multiplying and dividing length, volume/capacity, weight and time), and angles.