What are InvisiClues?

The essence of all interactive fiction is solving problems. The purpose of InvisiClues hint booklets is to maximize your enjoyment of the game by giving you only the hints that you need to continue and complete the story.

The invisible hints generally progress from a gentle nudge in the right direction to a full answer. The questions, which naturally have to be visible, have been worded to give away as little as possible. You should not use the presence or absence of a question on a certain topic as an indication of importance, and you should not assume that long answers are associated with important questions. This booklet includes dummy questions and answers in order to minimize the problem.

How to use this booklet

If you are stuck at some point in THE HITCHHIKER'S GUIDE TO THE GALAXY, find the question that most pertains to your problem. Uncap the marker and run it once over the first hint. The writing will appear in a second or two. If you are still stumped, go on to the next hint. (Remember to recap the marker when you are done to prevent it from drying out. And by the way, these books are not immortal. InvisiClues you've developed will start to fade after six months.)

Your marker contains more than enough fluid to develop the entire booklet. However, if your marker gets lost or dried out, you can order a replacement marker for a nominal fee.

Once you have finished the game, try the things in the "For Your Amusement" section. Don't look at them before you've finished, though -- they may reveal the answers to certain problems.