Welcome to Castle Slogar, where birthdays never end, everything is slightly cursed, and even the puzzles look like they need a nap. Unhappy Birthday at Castle Slogar is a delightfully dreary solo gamebook set in the wonderfully morbid world of Gloom. You’ve been invited—again—to celebrate Melissa’s 9th birthday, but the party has gone spectacularly wrong. Guests are lost somewhere in the castle’s twisting halls, and Lord Slogar has vanished entirely. Naturally, it’s up to you to wander from room to room, confront one miserable mishap after another, and try to salvage this sorrowful celebration.

Inside, you’ll find a full castle map to track what you’ve explored, room-by-room storytelling, and puzzles that are equal parts clever and cheerfully grim. And if you get stuck, an integrated hint site is ready to offer cryptic nudges and extra materials without spoiling the fun. With J. Scott Reeves’ signature Gloom art tying it all together, this gamebook is a perfect pick for solo players who love riddles, narrative twists, and beautifully macabre whimsy.