Unlockable: Extra Mode Finish Chapter 4 of Story Mode. Submitted by temal Hint – Unlock Biochemical Items After you complete a level such as a free mission, you notice your rank. If you get an ‘S’ rank (1000 total points) You get get special Biochemical Items for Item Creations by ‘Pete’. You get a different item for every mission. On the Mission were you have to Kill De Ragen you get the Biochemical Item ‘DE Ragen’.
