Thanks a lot! You can use the projectiles on the blocks that have the strike through, these are the breakable blocks, that is how you enter the location on the screenshot. So from the start immediately go to the left and there should be a row of breakable blocks in the wall exactly at the position where there is a line on the map. You have to position yourself correctly on the right step of the staircase to make sure you aim correctly. And then you should be able to get in the hole by using the L-shape and the flat shape.