There are two levels of this challenging blocker:
- White Monolith takes up a cell and is not removed from the board by any means. It does, however, participate in deleting lines/sections. When you complete a line/section with White Monolith in it - all the blocks are deleted as usual, while White Monolith stays where it is.
- Black Monolith takes up a cell and is not removed from the board by any means. It also blocks the deletion of any lines/sections it is a part of. Therefore, you need to remove all the other blockers without using the lines/sections containing Black Monolith.