Hello,
There is no longer an experiment at the link you gave: you probably created that project when signed off and therefore didn’t save it into your account
I have created a minimal variant of the self-paced reading template to integrate a table of the format you describe (with only 3 mock items though): https://farm.pcibex.net/r/nolGGc/
As described in the tutorial, participants will be assigned a group based on the project’s internal counter, which is incremented only once a submission is received (which is the default behavior). Complete a test run once and take the experiment again to see another group, or use ?withsquare=N in the URL to override the counter’s value
Let me know if you have questions
Jeremy