History YMMV / MentalOmega

* FridgeHorror: "Cyberanatomy" is set in the Xinjiang region where the cyborg production facility is located. Imagine what happens with the Uyghurs living there who are implied to be subjected to a [[UnwillingRoboticization conversion into soulless cyborgs against their will]]. Given China's track record of genocide and persecution against the Uyghurs, this would be a truly terrifying sight to behold.

* UnexpectedCharacter: [[spoiler:In spite of the statements that time-travel would not be involved in the plot of Mental Omega 3.x (unlike what happens in 2.x), during the cutscene in "Reality Check" (Epsilon 23), a Time Machine in ruins is visible when Yuri tells Libra of mistakes he had made.]]

** While most Challenges would end on this category due to [[SNKBoss the unfair advantages the enemies have]], the Regenbogen Challenge takes the cake. While all other challenges are difficult but predictable, letting you figure out how to turtle against the AI, Regenbogen is difficult and '''un'''predictable thanks to its random weather effects. It is perfectly possible for an otherwise impenetrable base to be outright ruined if you get several of the nastiest weather effects in a row. The Yellow weather effect, which sends up to 30 Hunter-Seekers to the players' bases, causing a lot of destruction on their path, is especially infamous, with many guides simply telling players to quit if they happen to get two Yellows in a row, moreso in the early-game. Even if you can survive the onslaught of the Yellow weather, you still have to deal with the weather effects that Suppresses all your non-epic, non-projectile units, and the one that effectively turns practically all your units into {{One Hit Point Wonder}}s, greatly limiting the viable factions for this challenge.

* DifficultySpike: Most challenges added after 3.3.1 are much more difficult than the original ones present in 3.3, with a few exceptions which are only slightly more difficult.

* NiceJobBreakingItHero: Remember, this whole thing occured because Einstein wanted to prevent the horrors of World War II using time travel. While our world may not be perfect, its a freaking utopia compared to the [[CrapsackWorld hellhole]] that resulted from him meddling with time.

* SequelDifficultySpike: Zigzagged; while the campaign and skirmish AI are ''much'' more difficult in the mod than in the vanilla game, their 3.3 version is far more benign and forgiving than how they used to be during 2.0 or 3.0.

** While most Challenges would end on this category due to [[SNKBoss the unfair advantages the enemies have]], the Regenbogen Challenge takes the cake. While all other challenges are difficult but predictable, letting you figure out how to turtle against the AI, Regenbogen is difficult and '''un'''predictable thanks to its random weather effects. It is perfectly possible for an otherwise impenetrable base to be outright ruined if you get several of the nastiest weather effects in a row. The Yellow weather effect, which sends up to 30 Hunter-Seekers to the players' bases, causing a lot of destruction on their path, is especially infamous, with many guides simply telling players to quit if they happen to get two Yellows in a row, moreso in the early-game. Even if you can survive the onslaught of the Yellow weather, you still have to deal with the weather effects that Suppresses all your non-epic, non-projectile units, and the one that effectively turns practically all your units into {{One Hit Point Wonder}}s, greatly limiting the viable factions for this challenge.
* ThemeNaming: All missions from Act 1 are named by existing songs.

* FridgeHorror: "Cyberanatomy" is set in the Xinjiang region where the cyborg production facility is located. Imagine what happens with the Uyghurs living there who are implied to be subjected to a [[UnwillingRoboticization conversion into soulless cyborgs against their will]]. China's genocide against the Uyghurs would be much more pronounced there.

* FridgeHorror: "Cyberanatomy" is set in the Xinjiang region where the cyborg production facility is located. Imagine what happens with the Uyghurs living there who are implied to be subjected to a [[UnwillingRoboticization conversion into soulless cyborgs against their will?]] China's genocide against the Uyghurs would be much more pronounced there.

* FridgeHorror: "Cyberanatomy" is set in the Xinjiang region where the cyborg production facility is located. Imagine what happens with the Uyghurs who are implied to be subjected to a conversion into soulless cyborgs against their will, China's genocide against the Uyghurs would be much more pronounced there.

* FridgeHorror: "Cyberanatomy" is set in the Xinjiang region where the cyborg production facility is located. Imagine what happens with the Uyghurs who are implied to be subjected to a conversation into soulless cyborgs, China's genocide against the Uyghurs would be much more pronounced there.

** To further add on to this, one user, known as "Demoman" to people on the Mental Omega Community Discord, makes giant text walls of how much he hates the current state of Mental Omega 3.3.4 and wants EVERYTHING explained to him in the missions themselves rather than just take it at face value.
*** Even after the 3.3.5 update, Demoman still complains to this day about certain plot issues despite Alstar, community moderator of the Discord, repeatedly telling him that it is never going to change.

** The end of The Raven in soviet act 2, the commander successfully hold off the allied invasion from Stalington until the camera suddenly switch to the raven flying over to your base as your radar suddenly went offline, the iron curtain became purple, to the point the screen goes black. You were expecting a result screen? Nope, you get treated by a jumpscare of Yuri's face with weird monotone voice and began controlling your mind and the game proceed to your next mission Awake and Alive with [[https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwiVppzm9-_cAhWE2YMKHeJGAswQjhx6BAgBEAM&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D-2aYQkf6FMg&psig=AOvVaw2DXLqmxRr0zNRzm029w7x-&ust=1534452462570181 this loading screen]] completely distorted and a disturbing music with only one objective listed RUN! Good luck sleeping tonight.

** Epsilon's Act Two debut, The Conqueror. The Soviets are hosting their second annual [[TheBadGuyWins Victory Parade]]; the [[HolyShitQuotient sheer spectacle]] is awe-inspiring, explicitly-invoking the title screen of ''Red Alert 3'' with columns of tanks, infantry, and waves of Kirovs marching down the main street in sync, indefinitely, in front of a cheering crowd, all while a ''Red Alert 2''-ified version of the Soviet March from ''3'' plays. You, as Epsilon, have a small fleet of Shadow Tanks you'll need to stealth through the partying streets, avoiding patrols and sentries, to get into position near five Nuclear Reactors you'll have to [[StuffBlowingUp destroy simultaneously]]; at one point, one of your tanks will have to ''[[RefugeInAudacity cross the parade grounds itself]]'', picking the optimal moment to dart across between waves of marching units. Once that's done, Yuri makes his entrance via [[EnemyCivilWar mass-mind-controlling large chunks of the parade and turning them on one another]], while large portions of the crowd explode into poison or mutate into Brutes. The entire scene devolves into absolute chaos, and it's from this chaos that you must then use your forces to seize the ornamental Topol-M's for Yuri's own purposes, ending with the assassination of Premier Romanov himself. Overall, the map is fun, stylish, and while tough, doesn't quite reach the levels of frustration as some of the others. It's a fitting way for Yuri to debut himself as the true BigBad of the war.

** Specific mentions go to the Epsilon level "Human Shield", you only have two Epsilon Adepts and somehow you have to use them to fight your way through Terror Drones (which are immune to mind-control) and Snipers (which out range and can one shot your adepts) in order to mind control Allied spies to steal Soviet technology. Also there's the Allied mission "Hammer to Fall" in which you have no anti-air units but somehow have to fight your way to a Soviet uranium mine which is guarded by ''attack helicopters''.

** However, there is still the infamous "Singularity", a remake of 2.0 mission "Duality", in which you have to spark a war between Pacific Front and China. Its difficulty lies in the fact that you had only 3 units to control and you were unable to lose any of them; the map is ''extremely'' densely packed with insta-death units and traps (a random kennel on the north side will spawn ''attack dogs'' if approached, almost guaranteeing death, and thus failure, for the unit who did so), AND you have to weave carefully between both bases to destroy a number of key structures, ending with an Iron Curtain. The map will BaitAndSwitch you multiple times by suggesting/showing multiple possible routes to take, but nine times out of ten all but one path will be guarded and result in unavoidable, unpreventable death. On anything above Easy difficulty, there will be patrols of Veteran units guarding many of the only routes forward you'll need to carefully dodge, lest they sound the alarm and summon unkillable Wolfhounds to wipe out your units. And the final, nasty cherry on top? Once you've finally reached and wiped out the Iron Curtain, you are then given a strict time limit to race all three units back through the base to the far side of the map to extraction before guaranteed failure. Put all of this together and boom. You have a mission which was not completed by 99% of players even on Easy difficulty - and can take hours (''very'' mandatory SaveScumming included) to finish for the few that did. It's also worth mentioning that "Singularity" was created by a mapper who likes to boost the difficulty of missions ''UpToEleven'' - to the point that even he is unable to complete some of his own missions.

** Epsilon's Act Two debut, The Conqueror. The Soviets are hosting their second annual [[TheBadGuyWins Victory Parade]]; the [[HolyShitQuotient sheer spectacle]] is awe-inspiring, explicitly-invoking the title screen of ''Red Alert 3'' with columns of tanks, infantry, and waves of Kirovs marching down the main street in sync, indefinitely, in front of a cheering crowd, all while a ''Red Alert 2''-ified version of the Soviet March from ''3'' plays. You, as Epsilon, have a small fleet of Shadow Tanks you'll need to stealth through the partying streets, avoiding patrols and sentries, to get into position near five Nuclear Reactors you'll have to [[StuffBlowingUp destroy simultaneously.]] Once that's done, Yuri makes his entrance via [[EnemyCivialWar mass-mind-controlling large chunks of the parade and turning them on one another, while large portions of the crowd explode into poison or mutate into Brutes. The entire scene devolves into absolute chaos, and it's from this chaos that you must then use your forces to seize the ornamental Topol-M's for Yuri's own purposes. Overall, the map is fun, stylish, and while tough, doesn't quite reach the levels of frustration as some of the others.

** However, there is still the infamous "Singularity", a remake of 2.0 mission "Duality", in which you have to spark a war between Pacific Front and China. Its difficulty lies in the fact that you had only 3 units to control and you were unable to lose any of them. Let's add to that fact that attacking most patrols will trigger alarms and boom. You have a mission which was not completed by 99% of players even on Easy difficulty. It's also worth to mention that "Singularity" was created by a mapper who likes to boost the dificulty of missions ''UpToEleven'' - to the point that even he is unable to complete his own missions.

* CriticalResearchFailure: The mod has two submarine units for the Soviets, the Typhoon attack sub and the Akula missile sub. What's the problem? Those are two different names for the same sub, "Akula" being the Russian designation for the class and "Typhoon" being the NATO designation. Even if we are to assume that the Akula sub is supposed to refer to the NATO designation for the Soviet Shchuka B-class submarine the problem would still persist in the form of the two submarines having each other's functions (The Typhoon is the missile sub and the Akula is the attack sub). Practically '''all''' Soviet missile subs were a remake of the [[VideoGame/CommandAndConquerRedAlert Red Alert 1]] Missile Sub in a way, and the Akula name stuck to that submarine concept around the heroic age of Red Alert 2 modding (read: between 2002 and 2006) and every mod simply just follows it.

** "Thread of Dread" (Soviet 20) is likely the hardest base-building mission in the two Acts. It is essentially a Superweapon Challenge against an enemy (the proto-Foehn Revolt) that holds '''four''' Nuke Silos (that are not armed at the same time, disrupting defensive uses of an Iron Curtain) and it sits at an incredibly fortified base full of Hammer Defenses and Sentinels, as well as Iron Dragons to snipe any attempt to use artillery to break through the defenses... which you have to do quickly, or your Construction Yard is eventually going to be [=2HKOed=] by consecutive Tactical Nukes (and you can't build another MCV as usual in the campaign). To make matters worse, the proto-Foehn base is supported by two Chinese ally bases, ''and'' there are two Epsilon bases next to yours that are both hostile to you (with the one on the left loving to send Basilisks and Magnetrons) and glorified meat shields that are going to fold after the first two or three nukes aimed at them. Oh, and the EasyLevelTrick of capturing one of the Epsilon bases to send Drillers with Engineers and capture the Mainframe with little effort was patched out, so that you can't build Drillers in this mission. Good luck.

* MostAnnoyingSound: "WARNING - The Paradox Engine is under 50% structural integrity!" beeping alert you get in "Insomnia" when the Paradox Engine's health drops below 50%. The alert is fine the first time its health gets below that threshold... but it quickly becomes annoying when you notice The Paradox Engine only self-heals up to 50% health... which means that even if you keep it well-protected, the moment an enemy unit as much as grazes the Paradox Engine, you'll get the alert. And it will happen a lot of times during the mission.