: Each of the 12 levels requires you to rescue captured Kikurians and collect diamonds. Achieving 100% completion requires rescuing all Kikurians and collecting every gem in a level. Level Progression

The adventure takes Hugo through several distinct environments across Jungle Island:

: The final facility Hugo must sabotage to stop the potion production. Passwords for Level Skips (PlayStation)

For a visual guide, the RetroAchievements community tracks 100% completion milestones, and full video walkthroughs are available on YouTube to help find any hidden Kikurians.

Are you playing the version or the Game Boy Color version, as the level layouts differ between the two? Hugo: Black Diamond Fever (2001) - MobyGames

If you are stuck on a particular section, you can use these level-specific passwords found at GameFAQs : △, △, O, □, △, △, X, △, △, △, □, O Level 4: Supply Line □, □, O, □, △, △, △, △, △, △, △, □ Level 5: Oil Rig △, O, O, △, □, □, □, △, △, □, □, □ Level 6: Diamond Factory O, □, X, O, □, X, O, □, O, X, X, O Key Hazards & Enemies