Link: https://scratch.mit.edu/projects/328947478/

Uses a script to report a list of which key(s) are pressed (can show one or more). You can press any key valid in the dropdown of the Key () Pressed? block, as well as the following extra keys below (using hacked blocks):

The following symbol keys on the keyboard: `~!@#$%^&*()-=_+\{}|;':",./<>?

The enter key

Note: This project contains many hacked blocks.

Bump

You don't need hacked blocks to do it. Just do:

<key [(letter (1) of [key to press]) v] pressed?>