You have the following options:

CONCEPT of prime number.

COMPOSITE number definition.

PRIME for knowing if a number is prime.

FACTORIZATION for knowing a number factorization.

CONGRUENCE generates a random problem about congruent numbers.

DIVISOR generates a random problem about divisible numbers.

SCORE set to zero.

CHECK you must press this button to know if your answer is right. In this case, the answer must be written in the space beside CHECK

VOICE The big button of the bottom of the screen allows you to select your option and give your answer using your voice. The voice recognition feature only can be used with an active internet connexion

HELP, only can be used with VOICE, allows you listening all the voice commands.

AUTHOR provides some information about the author.