The best runs come down to keeping the reticle steady and turning a rushing crowd into a string of clean headshots. Perks can make a run feel beautifully overpowered, though some rolls are practically dead weight, so good shooting still matters more than a lucky build. Full version unlocked, with the weapons, upgrades, and extra modes ready to play.
Later floors are considerably nastier, especially when cramped layouts, traps, and mixed enemy groups start colliding. Players comfortable with quick turns and twitchy aiming will settle in faster; everyone else may find the pace surprisingly exhausting. Turning off screen shake and flashing effects also makes longer sessions considerably easier on the eyes.