Location from Undertale / Deltarune by Toby Fox
Chapter 1's Dark World — a playing-card-themed realm ruled by a tyrannical King, explored by a reluctant prophecy fulfillment team.
The Card Kingdom is Deltarune's first Dark World, created from the school's unused supply closet. It is ruled by the King of Spades, guarded by his son Lancer's incompetent villainy, and populated by card-themed Darkners. Rouxls Kaard makes terrible puzzles. Seam sells items and drops lore. Jevil waits in his prison beneath the castle. The Great Board is the journey's metaphor made literal — the party progresses across a game board, encountering enemies and puzzles, building toward the final confrontation with King. The world is playful and dangerous in equal measure.
A dark fantasy realm themed around playing cards — checkered floors, spade and diamond motifs, castle corridors, and a Great Board where the party's journey plays out like a board game. The color palette is dark purples, blues, and blacks with card-suit accents. Card Castle looms at the far end.
Also known as: Chapter 1 Dark World, The Great Board