As your wall moves into the hillside you will want to step up the base as shown here. The base in this area (and all future step ups) should be installed as indicated above and as shown in the “base preparation” pages you can review through the link provided.
At each step up ensure the top of the base rock is level with the lower level of block.
This will allow each course to remain level as the wall moves into the hillside as shown in photo #4.
Ensure at least one block is buried into the hillside as shown in photo #5 to reduce the likelihood of erosion and undermining of your wall in the future. For additional questions, please visit allanblock.com.