Tomorrow, the remain chapters of Harry Potter and the Chamber of Secrets will be released on October 31 at 12PM (noon) GMT. Here is the official announcement.
Keep in mind that this is GMT, not the British Summer Time. That means if your time zone is US/Eastern, GMT is 4 hours ahead, not 4 hours ahead. That said, I’m not sure if they’re releasing at exactly 12 PM noon.
Nonetheless, as we have done before, I will again be posting all the walkthrough and cheats for the rest of book 2 as soon as the book is generally available.