The Key to the Kingdom (1990 UK)

About Key to the Kingdom, from BoardGameGeek:

In Key to the Kingdom, players are adventurers racing through a fantasy realm to retrieve two treasures-one of which must be the fabled Key-and escape the kingdom before anyone else can. Along the way, they'll face traps, battle monsters, and outwit rivals who might even steal their hard-earned treasures. Each player begins with eight equipment cards, which are essential for overcoming obstacles throughout the kingdom. Equipment can be lost in encounters but may be recovered in specific locations. The game's standout feature is its transforming game board: composed of six hinged panels, the board includes magical whirlpools that, when entered, cause sections of the board to unfold, revealing new realms and routes. This innovative mechanic creates a dynamic, ever-shifting world and introduces the possibility of leaving other players stranded when the board folds back. Key to the Kingdom (1990) is a standalone design distinct from the 2022 reimplementation, though both share the core themes of exploration, adventure, and whimsical danger.