Oddworld: Soulstorm – How to get all secret areas in Sorrow Valley
Secret Area #1
You can find the secret area after exiting from the first barrack. Out of the barrack, you need to go in the right direction. Then hop on to the first platform to the Secret area.
Secret Area #2
After coming out of the first barrack, you need to go in the left direction and continue your journey. Possess the last slig and use it to destroy the wooden platform and make the way clear for the below levels. Drop down a level and enter the pipe (see image) to find the Secret area.
Secret Area #3
You can find this Secret area after the ‘Fizzy Pow’ Tutorial. The secret area is behind metal sheets (see image)
Secret Area #4
You can find the last secret area at the top of step platforms. (see image)