Add level selection in guess number activity. ctivity: Guess a number [
Goal: Guess a number in a minimum of try
MultipleData1: Recommended age: 6-7
max number 100
MultipleData2: Recommended age: 7-8
max number 1000
MultipleData3: Recommended age: 8-9
max number 100000
MultipleData4: Recommended age: 9-10
max number 1000000000