It's a challenging game, even on medium difficulty. The main character, Lo Wang, is definitely fun to play as, always making cheesy, 90s one liners like Duke Nukem. Such "clever" one-liners include, "I am walking into walls now," or, "Oh: you are falling apart.” The weapons have nice variety, ranging from the conventional Uzi to the ridiculous decapitated head of a Demon Guardian that shoots freaking fireballs, and even... a heart. The exploration is excellent, with many secret rooms, optional backtracking (for finding more ammo, health, armor and even enemies), and destroyable set pieces that may lead to unlocking cool weapons such as the Rail Gun, if said set-piece is kept intact. Ammunition and armor are not as plentiful as you may think, and most weapons eat up ammunition quickly. This makes the player think of strategies to use instead of simply running around, guns blazing. The puzzles, while not the hardest, certainly provoke thought. That's what I love about this game: like its 90s FPS brethren, it's a smart FPS that definitely deserves to be checked out. There is little to no plot however, with the set-up giving you an excuse to kill enemies and make it to the end of the level. Though this is to be expected with an old shooter. Otherwise, I am unable to think of any more negatives. The best part: it's for free!