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- This article is about creating a human verification system in a Scratch project. For the human verification feature in the Scratch account creation process, see Creating an Account#reCAPTCHA.
The Math Method
In this method, the project asks the user some math to solve, to continue playing the project. First, create a custom block, or a broadcast. Create two or more variables, to store the numbers you will include in human verification. Use the Pick Random block to set the variables to any value. Now, use the Ask block to ask the question. Now, let scratch solve the problem and check the response. This is an sample:
when I receive [Human Verification v]
set [Human Verification 1 v] to (Pick Random (1) to (25)
set [Human Verification 2 v] to (Pick Random (1) to (5))
ask (join [Solve ] (join (Human verification 1) (join [ * ] (Human Verification 2) ))) and wait
if <(Answer) = ((Human Verification 1) * (Human Verification 2))> then
say [Correct answer!] for (2) seconds
else
say [Wrong answer] for (5) seconds
stop [all v]
end
The Keyboard Check
In this method, we ask the user to press certain keys, to continue.
when I receive [Human Verification v] say [Please press the spacebar.] wait until <key (space v) pressed?> say [Successful!] for (2) seconds
