It can be done with sugarcube, but I wonder if it is possible to create an interactive textbox with Harlowe in which the user enters values, and gets feedback - eg too low, too high, correct?
You need to state the name and full version number of the Story Format you are using, as answers can be different for each one. I will assume you are using the default version of Harlowe which is currently v1.2.4
Harlowe (1.x or 2.x) has no built-in way to do what you want but this comment in the Allowing users to input correct answers in HTML Text Box thread describes a hack originally created by csalzman which can be used to emulate the functionality you ask for.
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Harlowe (1.x or 2.x) has no built-in way to do what you want but this comment in the Allowing users to input correct answers in HTML Text Box thread describes a hack originally created by csalzman which can be used to emulate the functionality you ask for.