Heroes is divided into five entirely independent
sections, which you can complete in any order you
choose.
While each section is self-contained and solveable
independently, feel free to switch sections midstream
rather than appealing to the walkthrough, since that
might help you understand the other sections.
Since there are five separate sections, the walkthrough
is contained in five separate files, named for each of
the sections:
a.txt
e.txt
t.txt
r.txt
d.txt
For the most part the walkthroughs try to show you
all the setups for the situations, as well as the
solution.
You will only complete the game if you complete
all five sections in one playthrough.