- To to enter the snow tower, you need the key in the hideout.
- To deactivate the lines you have to destroy the crystal barriers.
(These are labeled with: "Red, Blue and Green Barrier" cost: 1AP)
- for the White Echo you have to destroy the White Barrier.
- To destroy the White Barrier you have to either destroy all other barriers and collect 10 spirits or destroy no barriers, but no lines gets deactivated.