Let's start with: I don't know. Also I can't read this language (BASIC variant?) and am browsing from a phone. But this line at least outputs the error message

Let's start with: I don't know. Also I can't read this language (BASIC variant?) and am browsing from a phone. But this line at least outputs the error message: https://github.com/rottytooth/INTERCAL72/blob/f94e0c8eaaf1347a3d9aaea58ddeffb9327ffc01/restored/ical.sbl#L406 https://github.com/rottytooth/INTERCAL72/blob/f94e0c8eaaf134... edit: probably slightly complicated :D but this makes me wonder if it's related to the source mutliplying some variable/register value by 3 in the error line: > You will need at least 3 lines of code, with one PLEASE statement among them. (from README) Just searching "PLEASE" also shows increments and a comparison with a number written in hex... so it should be easy to figure out the intercal "please" halting problem instance, right? :)