Chou Super Robot Wars M

Chou Super Robot Wars M (超スーパーロボット大戦M Chō Supā Robotto Taisen Emu, Ultra Super Robot Wars M) is a crossover mecha tactical role-playing/fighting game developed by B.B. Studio and published by Bandai Namco Entertainment. A PlayStation 4 updated edition of Chou Super Robot Wars AE, it was released in Japan on April 20, 2021 and in North America and Europe on October 1, 2021 as part of Super Robot Wars 30th anniversary. The game is a side-story of Project X Zone 3: War of Infinite Worlds, developed by the same crew a year after the release of its Ultimate Version and marking the first time the series crosses over to various video games franchises such as Capcom's Tech Romancer, Namco's Xenosaga, Sega's Sonic the Hedgehog and many more. It was also the fourth game in the Super Robot Wars series to be released in North America after Super Robot Taisen OG Saga: Endless Frontier and the first to be released on Europe.

With an extensive budget of ¥2,000,000,000 ($18,260,000), both games in the Chou Super Robot Wars brand were a commercial and critical success, having shipped 800,000 units in the first month of Japanese release and sold a combined 9 million by the end of the year, being two of the highest-selling game in the Super Robot Wars franchise.

Production
Main article: Chou Super Robot Wars AE/Production

Gameplay
Unlike its Nintendo Switch counterpart, Chou Super Robot Wars M marks a departure to the traditional gameplay that persists across the entire series as this is the first game in the series to come with multiple modes aside from the standard story RPG mode, composed of a total of 15 modes out of 18 menu select choices:
 * Story Mode - The game mode where the traditional Super Robot Wars gameplay takes into effect, where the player can progress through chapters of the canonical events of the game.
 * Single Play
 * Co-op
 * Campaign Mode -
 * Arcade Mode -
 * Versus Battle -
 * Tag Battle -
 * Elimination Match -
 * Battlefield Mode -
 * Robot Warfare -
 * Time Attack -
 * Survival Mode -
 * Tournament Mode -
 * Spectator Mode -
 * Mini-Games -
 * Online Mode -
 * Practice Mode -
 * Upgrades -
 * Gallery -
 * Options -

Plot
Taking place during the events of Project X Zone 3, various worlds across the Multiverse are slowly being destroyed one by one and countless millions of lives lost in the crossfire with the suspicion that a great evil is responsible for this.

Ten years after Unicron's empire of Decepticons laid waste upon Cybertron and forced the Autobots to flee their destroyed homeworld, Optimus Prime, leader of the Autobots, along with his comrades who were scattered across the galaxy seeking for a new planet, visit Earth… along with a wandering seemingly-almighty source of power called the AllSpark.

Meanwhile, in the Land of Light, the Father of Ultra observes the situation of what's happening with the Multiverse and understands that the problem is probably the gravest and most dangerous anyone will ever face, so he sends his sons Taro and Leo, as well Seven, Astra and 80, to summon a grand alliance of heroes from any world they could find that had not been ravaged by the Genocide of Heroes.

After some time, a grand alliance of good is formed from the heroes of ten Earths: Time begins to run out for the Earths in both the past and the future while in the present, the Father of Ultra tells the heroes of his plan to halt the approaching antimatter waves by transporting them to various times in various Earths where they help the Ultras build Time-Space Towers by harnessing the power and technology of the AllSpark that are to be activated to save reality.
 * Earth-35 (Universal Century Earth);
 * Earth-6C7G (Cosmic Era Earth);
 * Earth-A509 (Anno Domini Earth);
 * Earth-9909 (After Colony Earth);
 * Earth-8334209 (Post Disaster Earth);
 * Earth-123P (Build Fighters Earth);
 * Earth-007F (After War Earth);
 * Earth-10O8 (Regild Century Earth);
 * Earth-233 (Advanced Generation Earth); and
 * Earth-ZY48 (Future Century Earth).

Meanwhile, Ultraman Belial, the traitor of the Ultras, is abducted by an unseen foe. The foe makes a deal with Belial, who initially refuses but after reminiscing his defeat with Ultraman Zero, he reluctantly agrees, wanting nothing less than power, revenge upon all Ultras and dominion over the universe for himself. Belial then makes an alliance with various evil factions from other universes such as the Decepticons, Dr. Hell, Baron Ashura, Mycenae Empire (Mazinger Z), Embryo (Cross Ange), the Metarex (Sonic X), the Principality of Zeon (Mobile Suit Gundam Universal Century Timeline), the Holy Britannian Empire (Code Geass: Lelouch of the Rebellion), Xiliens (Godzilla: Final Wars), Dinosaur Empire (Getter Robo), Hyakki Empire (Getter Robo G), Jark Matter (Uchu Sentai Kyuranger) and many more, as a response to combat the interdimensional alliance gathered by the Father of Ultra.

As Belial follows the commands of the hidden foe, Reiji Arisu and Xiaomu of Shinra struggle to save their Earth in the future. In the present, the Autobots and NERV (Rebuild of Evangelion) combine forces to attack a wave of anti-matter and are joined by Sänger Zonvolt, Mothra and Ultraman Zero before Reiji and Xiaomu arrives from the future; unfortunately, they are pulled away from them and abducted. Throughout time and space, the Time-Space Towers are attacked by the united legion of villains led by Belial and several heroes die protecting them.

The ten Earths suffer as the antimatter wave approaches while on Earth-1657, the protagonists of Project X Zone 3, Adam Pines and Princess Eve Butterfly, manage to save Queen Amayano who becomes the sole survivor of her universe. Ultraman King engineers the completion of the Towers, as the King and Queen of Mewni, the parents of Eve, arrive for backup and are revealed to have survived after Mewni was seemingly destroyed. As EVA Unit-13 goes berserk and initiates the Fourth Impact, Unicron and Ultraman Belial see this as an opportunity and lead an army of Angels, Decepticons, kaiju, Metarex and villains on all-out assault on the Earths as the Time-Space Towers are attacked once more. After Belial defeats Zero, he becomes one with Unicron and detonates a Time-Space Bomb, destroying Earth as a result, creating a black hole to accelerate the devastation of the antimatter wave and seemingly dooming the Multiverse forever.

However, Ultraman King used all of his power to reverse the damage Belial had caused, losing his body in the process, as King's energies drift across the Multiverse, the Time-Space Towers are activated and drag ten Earths into a limbo dimension. However, this is only a temporary solution, as they are not merging properly since the Towers were not yet ready upon activating. As a result, they would soon occupy the same vibrational space that could possibly impact with each other and destroy them all together.

A mysterious woman named Madoka, who claims to be the daughter of Reiji and Xiaomu from the future, appears and pledges to save the Multiverse. Adam, Eve and Isaac Flynn call most of the heroes to the Shinra HQ and ask them to help; uncharacteristically, many of them doubt the seriousness of the problem but eventually they all agree to help. The enemy reveals himself at last: the Lord of All Evil and Darkness, Satan. Shinra HQ comes under attack as the heroes struggle to survive; sacrificing herself, Eve uses her powers to hold steady the remaining Earths and halt the antimatter waves. Unfortunately, the three-hundred remaining worlds are being controlled by the alliance of evil, with the help of Belial, whose powers have been enhanced by Satan, guided by Evilina the Antichrist and Scheisse von Arschloch the False Prophet, and when the heroes try to help the people of the worlds, their heroes attack them and free Reiji and Xiaomu, along with some other captured heroes. Eve, however, manages to pull the 300 Earths into the same limbo dimension as the ten Earths where they will temporarily be held safe, but at the cost of her powers.

A council of heroes is called, with Adam, Eve and Isaac speaking to a delegation of the 300 mightiest from each saved Earth. Between them, they tell the history of the Multiverse, the rebellion of Satan and the true enemy behind this whole catastrophe. Eventually, a gathering of heroes is assembled and Madoka opens a portal to the Antimatter Universe. The heroes enter and are instantly attacked by Unicron the Decepticon God, which had been under Satan's control this whole time, before some of them are able to get not to Satan but to the true mastermind behind all this… the Anti-God. The heroes battle the malevolent deity as Xiaomu sacrifices her immortality to reduce the Anti-God to an energy form which forces it to retreat.

More to be added...

Characters
(*) - Unlockable, playable later on in Story Mode (**) - Unlockable, unplayable in Story Mode (***) - Unplayable

Music
Opening Theme: Ending Theme:
 * TRANSFORMERS EVO.
 * Performed by: JAM Project
 * Composed by: Hironobu Kageyama
 * Lyrics by: Hironobu Kageyama
 * Arranged by: Daisuke Kikuta
 * Chōdenji ~We are Brothers 2021~
 * Performed by: Super Robot Music All Stars
 * Composed by: AYANO (of FULL AHEAD)
 * Lyrics by: Shoko Fujibayashi
 * Arranged by: Daisuke Kikuta

Trivia

 * Not counting the mobile game Super Robot Wars X-Ω, Chou Super Robot Wars Æ and M surpass 3rd Super Robot Wars Z as the game with the largest playable cast in the series.
 * As a side-story to Project X Zone 3, characters, villains and plot elements from the game are also present here. Many other characters only appear in cameos in cutscenes.
 * References from Project X Zone 3 are also made in various points of the game.
 * The last chapters of the game also take place at the same time and place as PXZ3's final events.
 * To celebrate the 55th anniversary of Ultraman, the 50th anniversary of Kamen Rider and the 45th anniversary of Super Sentai, characters from these respective franchises appear in this game. This also marks the first appearance of a character(s) from the Ultra and Kamen Rider series in a Super Robot Wars game.