DOA2: Hardcore

Dead or Alive 2 takes after its predecessor in gameplay, retaining its speed and reaction time-focused combat. The two kinds of hold, Offensive Hold and Defensive Hold, return; the latter are executed by holding back or forward on the directional pad along with the guard input to either force away or counter-damage an opponent. The "danger zones" from the original are removed in favor of more interactive areas.

One unique addition in DOA2 is that fights can occur on either water or ice; when a character is on such a surface, all non-knockdown, non-launching attacks will induce a stun on any successful hit. Walls and falls in the middle of stages are everywhere in the game. There are also some walls that are either electrified, or booby-trapped, clearly causing significantly more damage when a character is slammed into a wall by either a knockdown blow, a throw, or a hold, thereby encouraging such attacks to the wall. Many stages have multiple floors: to get to other floors of the stage, one character must be knocked off a ledge and fall into the next area. These falls deal usually high damage, but not enough to knock the opponent out.

Fame Douglas, founder and CEO of DOATEC was killed at the end of the 20th century. He was renowned as the sponsor of the legendary Dead or Alive World Combat Championship. After his death, the world began to become chaotic. In the middle of the chaos, it was announced that the second Dead or Alive World Combat Championship will be held.

The purpose and significance of the tournament changed after Douglas' death. The promoter of the second Dead or Alive Championship, who is fond of conflicts and jealous of the strong, is responsible for Douglas's death. The new promoter, Victor Donovan, is more than a corrupt mastermind, but a man of pure evil. His involvement in the tournament began to bring a sense of terror to the world, resulting in the infamous tengu disaster.

The gameplay and graphics were enhanced and based on a better game engine than the one used in the first game, as all resources went into the characters and the stages. Running on the Sega NAOMI arcade board, it allowed the characters and stages to appear less angular and more detailed. Wanting to emulate gorgeous scenes of martial arts movies, Tomonobu Itagaki and Team Ninja went so far to invite professional martial artists to perform motion capture, making the characters' moves smoother, and developed multi-tiered stages where opponents can be knocked off edges of landmarks down to lower levels where the fight continues.

In a June 1999 interview with German magazine MAN!AC, producer Tomonobu Itagaki revealed that the development team consisted of approximately 40 people, fewer than ten of whom were programmers, with the remainder primarily responsible for design. He explained that the Sega NAOMI arcade hardware significantly accelerated development compared with the Sega Model 2 system used for the original game. Whereas testing a prototype on Model 2 required approximately a day to prepare a flash ROM and install it in an arcade cabinet, prototypes could be tested on NAOMI within two to three hours. Itagaki also stated that some character animations were created manually, while others employed motion capture, including performances by a female model. He cited the waterfall in The Legend of Zelda: Ocarina of Time as an inspiration for the game's waterfall stage.

Dead or Alive 2 was "universally acclaimed", scoring 91% and 91/100 on GameRankings and Metacritic. In Japan, Famitsu scored the game a 34 out of 40.

Dead or Alive 2 brought more than a profit of 2 million dollars. In Japan, Game Machine listed Dead or Alive 2 on their December 15, 1999 issue as being the second most-successful arcade game of the month. The PlayStation 2 version would top the Japanese charts on release, coming in number 2 during Week 14 in 2000. The Dreamcast version also top the Japanese charts on release, coming in number 2 during Week 40 in 2000.

Dead or Alive 2 was notable for improving and popularizing the concept of multi-tiered environments, also known as stage transitions. The game took the concept to a new level, creating a more interactive and engaging gameplay experience. Its interactive multi-tiered environments offered all kinds of interactive features that made the game feel alive. The way the intensity of the action triples when knocking opponents off of edges such as cliffs or out of windows, then leaping down after them and continue fighting down below made the experience feel very dynamic, strategic and rewarding.

GamesRadar+ included Dead or Alive 2 on their list of best Dreamcast games, stating that "Dead or Alive's first sequel used separate graphics engines for its fighting and cut-scenes, allowing for unprecedented graphical fidelity." com ranked it as the ninth top fighting game of all time, "perhaps most important for introducing Itagaki's famous breast physics engine." In 2020, TheGamer ranked DOA2: Hardcore "2nd best launch game for the PS2", calling the combat "lightning fast, and easy to pick up with counters and reversals that work better than any other fighter", also stating how the character animations are "smooth and fluid and move around the 3D space more naturally than similar titles like Soul Calibur", and stating that it visually "looked a generation ahead of games like Tekken Tag Tournament and Street Fighter EX3."