Acquire the Key of Serpentis, then play level 10-7, "Jokulkyrkja", in Antarctica. Get on the platform with the odd snake sign and it will certainly decrease into a Boss battle. Beat in charge by tossing knives at the crystals on the ceiling in order to break each area of the dragon platform you are riding on. After in charge has actually been beat you will certainly unlock Antarctica for all characters, Jim Hawkins, and the alternate ending.
Antarctica Temple
Complete all Akumpa Ruins levels. To unlock Antarctica Temple for all characters, view the True ending.
Character Colors
You can adjust your character's color palette once you collect four golden skulls.
Commander Video
To unlock Commander Video, collect 6 golden skulls.
Counseil's Duty Free Shop
Collect twelve Golden Skulls.
Easy "Serpentine" Trophy
You can find the Key of Serpentis in level 2-1, near the exit door. It only becomes accessible after unlocking Antarctica and when using Aban Hawkins, the main character.
Easy 'Stone Cold' Trophy
To earn this trophy you must complete Antarctica. The way to do this is to get the Key of Serpentis so you can unlock the final stage and Boss and then kill that Boss.
Key of Serpentis
Play level 2-1, "Rush into the Ruin", at the Ukampa Temple. One the right side of the exit is a unique block with a key symbol. Remove the key block and enter the new area to the right of the exit. Note: Removing the block may require all Golden Skulls. The Key of Serpentis can be found in the center of the temple area.
Lost Levels mode
Collect ten Golden Skulls.
Pokemon Reference
After you clear the first world, a long cutscene follows. Aban will talk about the temple of Poko-mum and mistakenly refer to it as Pocket Monster, which was the original name for Pokemon.
Tower of Nanar
To unlock the cooperative mode, Tower of Nanar, collect 5 golden skulls.
Various Characters
Complete the indicated task to unlock the corresponding character.
Character
How to unlock
Commander Video
Collect eight Golden Skulls.
Curly Brace
Collect thirty Golden Skulls.
El Testigo
Collect twenty six Golden Skulls.
Jim Hawkins
View the True ending.
Juni
Collect eighteen Golden Skulls.
President Thompson
Collect twenty Golden Skulls.
Sugimoto
Collect sixteen Golden Skulls.
Tina Hawkins
Complete Ukampa Ruins.
Zombie
Collect twenty three Golden Skulls.
Various Trophies
Complete the following tasks to unlock PlayStation 4 trophy rewards.
Trophy
How to unlock
Collector (Gold)
Unlock every character and costume.
Golden Boy (Silver)
Complete the Golden Temple.
Headhunter (Silver)
Collect all golden skulls.
Lost and Found (Bronze)
Complete the Lost Levels.
Serpentine (Bronze)
Find the Key of Serpentis.
Speed Runner (Silver)
Complete every stage of the main game as Aban Hawkins with a cumulative time of less than 30 minutes.
