Think of a number from 1 to 60. If you see your number on the card shown, click yes. If you don't, click no. Repeat for all 6 cards. If the number shown at the end is not your number, your number is not in the 1 to 60 range or you incorrectly answered a question.
This project works using binary. Lets say your number is 36. The binary for that would be 100100 (Contains 32, not 16, not 8, contains 4, not 2, not 1, or 32 + 4) On card 1, it shows numbers that add one, which is the last digit of binary (000001). If you say yes, that means the project will add one to your number to calculate what it is. On card 2, it shows numbers with a 1 in the second to last position (000010) so if you say yes on this one, it adds 2 to the final number. This gets repeated for all the other binary digits. So if you want to get 36, first get the binary (100100), flip it (001001) then convert the 1s into yes and 0 into no (no no yes no no yes) and answer the questions with it. The result is 36.