The Wonderland Gambit is a
science fiction trilogy (only!) by
Jack Chalker. The focus is on
virtual reality and the blurred boundary the characters experience between virtual reality and the real reality. The characters start to notice that
everything you think you know is wrong, and somehow the elusive
Matthew Brand and his
brand boxes are related to it, but how?... The movies
The Matrix and
eXistenZ are reminiscent of these
books.
The titles: