This game was released in Japan on December 23, 1998, and finally arrived in the US on September 9, 1999. It marked the introduction of a new style of play for Knuckles: treasure hunting.

KNUCKLES' STORY

Knuckles' Script
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KNUCKLES' ZONES

Station Square (adventure)
Speed Highway (action)
Casinopolis (action)
Mystic Ruins (adventure)
Red Mountain (action)
Lost World (action)
Egg Carrier (adventure)
Sky Deck (action)

KNUCKLES' BOSSES

Chaos 2 (Casinopolis)
Sonic (Mystic Ruins)
Chaos 4 (Mystic Ruins)
Chaos 6 (Egg Carrier)