I do not own the basic UK game version or the first UK edition rulebook with the maze, the puzzles, or any of the magazines or sticker book, but I still consider my collection complete as I have all of the actual games.
I have:
HeroQuest game system (US) x4

all with double figures, furniture and tiles, one set painted
HeroQuest Advanced Quest [Dark Company] (UK)
Kellar's Keep quest pack (US) x 3
Kellar's Keep quest pack (AUS) top opening hard box edition
Return of the Witch Lord quest pack (US) x2
Return of the Witch Lord quest pack (AUS) top opening hard box edition
Against the Ogre Horde expansion (AUS) top opening hard box edition
Against the Ogre Horde expansion (UK) flap opening soft box edition
Wizards of Morcar expansion (UK) flap opening soft box edition x2
HeroQuest Elf quest pack (US) x2
HeroQuest Barbarian quest pack (US) x2
HeroQuest Adventure Design Kit
The Fellowship of Four HeroQuest novel
The Screaming Spectre HeroQuest novel
The Tyrant's Tomb HeroQuest novel
HeroQuest CD computer Game by Gremlin
HeroQuest Nintendo game cartridge prototype
Advanced HeroQuest game
Advanced HeroQuest Terror in the Dark expansions
Advanced HeroQuest paint set
200 or so HeroQuest figures converted to Warhammer armies greenskins

, Chaos

, and undead
Battlemasters game (US) x7 all but 2 converted to Warhammer armies
Battlemasters game UK version (green trays slightly different labels, tiles, stickers, rulebook and box art than the US version)
Battlemasters Chaos Warband expansion (UK)
Battlemasters Imperial Lord expansion (UK)
Warhammer fantasy battles editions 3-8, with large armies for the Empire, Bretonnians, Slann, Undead

, Vampire Counts

, Tomb Kings

, Goblins

, Orcs

, Ogre Kingdoms, Chaos Warriors

, Chaos Beastmen, Chaos Demons

, Skaven, High Elves, Wood Elves

, Dwarfs

, Dwarf Slayers, and Norse

.
DarkWorld game x3
DarkWord Village of Fear
"feast your eyes on this, Rare and wonderful!" Smaug

Complete stack o' HeroQuest sure looks nice


My Dungeons & Dragons collection on the left, my Warhammer books, Conan the barbarian books, and Lord of the Rings books on the right

HeroQuest with All Expansions and Boxed sets


UK HeroQuest expansions and boxed sets

All US HeroQuest expansions and boxed sets

Advanced HeroQuest with all expansions and boxed sets

HeroQuest games and novels

Battlemasters UK and US versions and expansion sets (available UK only)

Warhammer editions 4-8 which include miniatures (1-3 did not, just rule books)

Darkworld board games (HeroQuest type games) I am still missing Dragon's Gate

By Crom I'll split you crown to crotch to see if your guts are yellow as I think they are nithing.BARBARIAN Ulrich
The last music you shall ever hear will be my bowstring as your forehead sprouts a feathered shaft, pity.ELF Cael Darkhollow
Tomes grimoires manuals atlas formularies compendiums codexes bestiaries folios scrolls... Am I missing anything before we leave?WIZARD Eldritch Ulrich Heironymous Kigam Magister
Some quick axe work an' we can count the coins and gems.DWARF Wulfram Magnussen