Type any number in Start Counting and Stop Counting. The Counting will start from the number you put in Start Counting and End with the number you put in Stop Counting.
Fizz at and Buzz at could also be any number but that must make sense. For example:If starting number 1 and End number is 20, and you type 3 in Fizz At and 5 in Buzz at, then you will get Fizz for all numbers that can be multiplied with 3 (3, 6, 9, 12, 15, 18), you will get Buzz for all numbers that can be multiplied with 5 (5, 10, 15, 20). However, you see that 15 is common for 3 and 5. So for 15, you will get FizzBuzz instead of only Fizz or Buzz
So wherever Fizz, Buzz or FizzBuzz is there, you can apply any rule according to your need. The most basic rule is: ask students to quickly tell the missing number.