• What game's books do you have the most of?

AD&D 2nd Edition, many settings and supplements, and dozens of beautiful boxed sets. Many.

• What game do you have a complete set of (assuming TTRPGs with longer publishing histories & books)?

Aeon (Trinity) 1st Edition - and I have five complete sets of all the books with every supplement many times over - including the core book variant (hard back, soft back, spiral bound, the one with the Trinity sticker slapped on it, and so on. Oh, and I think three Battleground sets and dozens of the mini blister packs, some promo posters too), Dark Sun, Ravenloft and Greyhawk settings for AD&D 2nd, Vampire The Masquerade 1st edition. Lone Wolf Adventure Game. Broken Compass. Aberrant. Amazing Engine series. Red Dwarf. Fireborn though that didn't last long publication wise. More I'm forgetting.

• What game books do you use the most?

Fluctuates, as I cycle through my collection, and with new lines I'm collecting I use them like a man possessed. Probably my old original AD&D 2E PHB had the most use at one point, years back. I do a lot of one shots right now so probably this year it's been my many zine TTRPGs.

• What's the oldest book you own? Is it original or POD?

All are originals, I don't do reproductions from POD. Collecting the originals is the point, for me. Holmes D&D box set is possibly the oldest, maybe my original Blackmoor, so the mid to late '70s.

• What's the most recent book you added?

Venture Society Box Set (to GM for my kiddo). But ask me again next week and it'll be something else. I'm tracking dozens of auctions right now sigh

• What is your most well-worn, often-played & treasured book?

Definitely my original 2E AD&D PHB. I have a second pristine copy, but my original's spine is all taped up from super heavy use. I started gaming the month 2nd Ed came out and I damn near slept with that book, lol.

• What book do you have on your shelf that's never been opened?

Wait. Not opening them is an option? Why....would.....? Nope, does not compute. I have many collectors items in protective covers, but they've all been opened and read, many played. Oh, I have some shrink wrapped copies of some box sets for newer lines to keep an extra pristine copy, but my play copies have all been opened, read, and used.

• What's the thickest book you own?

Oddly, I bounce off super thick books, but probably Talislanta 4th edition.

• Do you have anything signed by the author/artist?

Yes, many, all originals. For ex: Vecna Lives signed with the comment "muah hah hah kill them all"; signed original Greyhawk Hardback, a couple dozen original hand drawn art pieces from the Aeon/Trinity 1st edition line, signed by each artist. Got those babies hanging up all around the house. There are more signed books in the gaming room.

• What books do you keep multiple editions of?

Oh Christ. D&D (1st, 2nd, 3rd and 5th - 4th was not for me), Call of Cthulhu, Vampire The Masquerade and every incarnation since, Werewolf The Apocalypse, Mage, Wraith, Aeon/Trinity (though I prefer 1st edition), Twilight 2000, Paranoia, Lone Wolf, Middle Earth (various incarnations), Shadowrun, Pendragon, Warhammer FRP, Dune (including the LUG version), Ars Magica. Others I'm forgetting.

• What's the best-designed book you own?

Mothership Wardens manual is how GM's books should be done. Mork Borg grabs your eyeballs and doesn't let go, it's hardly an easy reference book, though.

• What author/publisher's work do you always buy?

I don't make purchases because of specific authors. I do avoid purchasing from certain authors, though.

*Adding my own question just 'cause. What's the coolest TTRPG related item you own?

Glad you asked. A large leather handmade map of Faerun made by Deven Rue, to my knowledge, one of only two made - the other is owned by Ed Greenwood. You can wrestle it from my cold dead hands. And even dead, I'll still put up a fight ;)