From the Space Quest FAQ: * Space Quest Companion, by Peter Spear This is an official novelization/hint book for Space Quests 1-4 in the First Edition, and 1-5 in the Second Edition. * The Official Guide To Roger Wilco's Space Adventures, by Jill Champion & Richard C. Leinecker This is an official novelization/hint guide for Space Quests 1-5. There are two editions. The first edition portrays SQ1 from the perspective of the original version of the game (and only goes up to the 4th game), and the second from the perspective of the remake.