Hello,
I re-created a simple puzzle that we have in our Math book. If the correct answer (number) is placed in the input box the number turns green and a correct sound is heard, if the number is wrong it turns red and a false sound is heard. When the puzzle is completed a text box appears to show that it's correct. I also created a reset button in order to reset all numbers to undefined ? and start over. In order to do that I used the if command in every input box properties. For example number 3 is the correct answer, in scripting ,on update I put these statements
If[a ≟ ?, PlaySound["#HCh4BKFa"]] this statement in not working
If[a ≠ 3, PlaySound["#RskKN4HU"]] this statement is working fine
If[a ≟ 3, PlaySound["#umhEKbkN"]] and this is working fine
My problem is that when everything resets to ? I hear also the wrong sound 7 times as many as my input boxes which is very annoying :( Any help will be appreciated
Thank you in advance
Here is my file if you want to see it
The same question 
a==? is ever false. try to use ¬isdefined[a] instead
saludos
Thank you ! I solve it by using instead of If[a ≠ 3, PlaySound["#RskKN4HU"]] those two statements
If[a > 3, PlaySound["#RskKN4HU"]] and If[a < 3, PlaySound["#RskKN4HU"]] but your way is much more better :)
See my corrected files here
https://ggbm.at/cEg3w5gd
https://ggbm.at/asBuk5BQ
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