When you first enter: note the tiled area up top. Two dots dots will appear hear. One is green-ish (which will be on the right) and the other is blue-ish (on the left). Keep that in mind. Go right as if you are going to Fractus, paying attention to the top of the map. About mid-way through, you should see a GREEN movable boulder amongst a few rocks. You're welcome to move this boulder to that tiled area now, or you can skip this next paragraph while continuing right towards Fractus town.
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This green boulder is going to where the green dot is or will be. Start by getting behind it--there is an opening to the top right of the rocks. It looks like there isn't, but there is if you run into the top right most rock from below it and go left. Push the boulder down. Then, begin your journey of pushing a boulder to the left to the green dot. You have to move it up and down a little to avoid objects, but it is straight forward. End with the green boulder on the green dot (or near the right side of the tiled area). Head back to the path (I recommend pushing the Yellow rock down across to the path to get it out of the way in advance) and shoot right as if going to Fractus again.
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Just before you get to Fractus though, you'll see a RED and BLUE rock at the top. You also might see the switch to the top left of the dead tree. That switch and BLUE rock is our goal. Push the red rock up. Then enter the doorway, make your way around the tree, and activate the switch. Then, go behind the blue rock from above (yes there is a small space). Push that blue rock down to the path. Enjoy pushing this blue rock to the left for a while (keep it on the path)! Once you get to where the yellow-ish rock is, stop pushing it. You need to move the yellow rock out of the way (if you haven't already). Push the yellow rock up twice to the pot. Then push it to the right a few times. Go back to the blue rock and push it through the opening the Yellow rock left us. Push it into the jar like the yellow rock but push it to the left once. Go below it and push it up three times. Now push the blue rock to the left and land it on the blue dot. If you have already done the GREEN rock in the previous paragraph, then the portal will appear in the middle of the tiled space. Enjoy facing Corsire! If not, go back to the right and read the preceeding paragraph.
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