Historic mode:
     Unlock  any  five of the extra bonuses. Historic mode changes the
graphics to sepia tone colors.

Extra bonuses:
     Complete  the indicated task in each chapter to unlock a figurine
for the Wax Work.

Chapter 2  - Take all three tea cans and stack them on the other cans. 
Chapter 3  - Find all five starfish and pick up Jack's duffel bag and 
             enter room 7 in the hotel.
Chapter 4  - Free Pandu of all three accusations. 
Chapter 6  - Repair the boat with hammer and paintbrush and slash all 
             seven pumpkins. 
Chapter 8  - Get all three cups and place them on pedestals/ 
Chapter 9  - Find Major Bug and give it to the British guards. 
Chapter 12 - Assemble the signpost.