Original game design & coding by Will Crowther and Don Woods; game conversion design enhancement & coding by Mike, Pete & Nick Austin. 68000 adventure system written by Mike Austin; Amiga conversion by John Jones-Steele. Graphics by James Horsler. Text by Pete Austin.
 COLOSSAL ADVENTURE, only available as part of the JEWELS OF DARKNESS compilation on the Amiga, enhances the original text-only incarnations released for 8-bit platforms by adding graphics, more extensive text descriptions, an extended parser that understands many more commands and other user-friendly features (e.g. multitasking, a quit back to WB option).
 COLOSSAL ADVENTURE is the first installment in Level 9'sMiddle-Earth Trilogy, which also contained ADVENTURE QUEST and DUNGEON ADVENTURE. The Middle-Earth Trilogy was later published in enhanced form as a compilation and renamed to JEWELS OF DARKNESS, albeit with references to Tolkien changed or removed, reportedly, for legal reasons.
 COLOSSAL ADVENTURE was Level 9's adaptation of the first computer text-based adventure game ADVENTURE (aka ADVENT, COLOSSAL CAVE, COLOSSAL CAVE ADVENTURE), written by Will Crowther in 1975/76 and enhanced by Don Woods in 1977. Originally released for the DEC PDP-10 mainframe computer and containing almost 300k of Fortran code, the game was strongly influenced by J.R.R. Tolkien. COLOSSAL ADVENTURE draws even more inspiration from Tolkien's writings and features an enlarged master game with an additional 70 locations, and a more detailed outside world than the original.
TRIVIA: Originally released in 1982 on the Nascom and BBC Micro, COLOSSAL ADVENTURE was the first game ever published by Level 9.