Nightmare Mode (SAS4)

Nightmare Mode in SAS 4 costs one Nightmare ticket to play; tickets are replenished periodically. Zombies are much harder, and each map is individually redesigned. In addition, Nightmarish zombies exist, which are much larger than normal, and have five buffs, including "Nighmarish" - unlike any other case, a Nightmarish zombie can have both Fiery Skin and Poisoned Limbs. Multiple bosses spawn at times such as the Onslaught countdown end, the Vaccine train platform, etc. Even a group of players at intermediate levels may meet bosses such as "Nightmarish" Savage Devastators or a swarm of Nightmarish Regurgitators, which is similar to a Savage Regurgitator in terms of size and HP.