Under-appreciated due to being a challenge level and because there are many of challenge levels back then in 2.1 that look better than this in visuals. Looking back to this, I realized how boring every other challenge levels are, same kind of glow design, same quality. This level is an abstract to all of those challenge levels, rather keeping the simple blank design with a slightly thick outline, carried by the brutal looking by the structuring and the intense atomosphere, making you feels like you are hopeless and surrounded by moving enermies whose could eliminate you in no time. Additionally, this level feels like a boss-fight level and that happened because of move and pulse trigger usages,