* BrokenBase: The story. Some consider it to be well-written mainly because of the character interactions and Emerl's story arc while some find it to be annoying due to the {{flanderization}} of some characters, the long dialogue in the cutscenes, and [[ExcusePlot the plot]] where characters fight each other to train Emerl.
* CharacterTiers: Two tiers in particular are such outliers that it basically becomes:
-->1. Emerl at the end of the game[[note]]the character combos and instant kills were {{Game Breaker}}s, as was [[SNKBoss Ultimate]] [[TheComputerIsACheatingBastard Emerl]], who had all the Ultimate skills, [[{{Cap}} when there was no way to get that many points as a regular player]][[/note]]\\
2. A couple of tiers of everyone else, depending on their healing skill.\\
3. Emerl at the beginning of the game.
%%* EarWorm
* EnjoyTheStorySkipTheGame: The gameplay is decent but considered to be too repetitive and nothing spectacular. The game's main draw arguably comes from Emerl and his character arc throughout the game.
* GameBreaker: So many it [[GameBreaker/SonicBattle has its own page]].
* IronWoobie: Emerl.
* MoralEventHorizon: Eggman [[spoiler: making Emerl go berserk]] at the end of the game, after Emerl was nice to him and thanked him for waking him up.
* {{Narm}}: [[spoiler:"...and shall become Gizoid, the conqueror of all..."]] is hard to take seriously, due to having an InherentlyFunnyWord in the middle of it.
* NightmareFuel: Emerl's stated purpose when he finally obtains all the Emeralds.
* ParanoiaFuel: When in distress, or receiving an upgrade, Emerl sometimes looks directly at the player, gains a {{third eye}} that looks realistic and [[LeaningOnTheFourthWall stares out of the screen]], [[FaceFramedInShadow is shaded ominously]], and speaks in a strange, stilted voice. [[VideoGame/SonicR Tails]] [[MemeticMutation Doll]]'s got nothing on this.
* PlayerPunch: After spending a huge amount of time learning about Emerl and training him to be an amazing fighter, [[spoiler:[[TearJerker Sonic has to]] ''[[TearJerker destroy]]'' [[TearJerker him]].]]
* SelfImposedChallenge: If you're feeling lucky or are otherwise just confident in your skill, try to get through the whole game using nothing but Emerl's initial moveset. [[BlatantLies You'll probably be fine]].
* ScrappyMechanic: The ridiculous number of storyline fights that are immediately followed by, essentially, the same fight but with twice the [=KOs=]. This may have been an attempt to increase the number of Skill Points available, but if so, there were better options.
* ThatOneAttack: For many it's Gamma's [[TakingYouWithMe Recovery Mode]]. He does spell it out for you, however, and after minimal practice it should be easy to be able to guard it. The high power makes it give you a LOT of meter. Now, when a Guard Robo or Phi has this, you're in ''real'' trouble, because they don't [[CallingYourAttacks go announcing it]].
** Eggman has a similar one, except it comes out ''immediately'' when he's K.O.ed; the upside is however is that it doesn't have a big radius around himself and he'll suffer from a bit of knockback at least give you some distance when it happens.
* ThatOneBoss:
** Eggman can be one given his missile spam and tendency to explode when knocked out.
** The fight between Rouge and Team Sonic at the end of the third chapter. Being forced to fight three against one is just torturous unless you stay in the air and pick them off slowly, or if they didn't set their auto-block to your Ground Power move.
** The Guard Robots as Knuckles. At first it's not bad, with just one. Then you fight two. Then three. No breaks in between. If you're not good with Knuckles, this is a ''nightmare''.
** Any Phis copying Gamma, especially late-game. If you have any allies you can't afford to have give free K.O.s to them, then for sure you'll be having trouble trying to keep them alive since they'll never move away from his suicidal explosion. Your best hope is usually a CPU-controlled Emerl with the highest defense setting possible if you managed to unlock it (Shadow Style + Shadow Strength Support).
** Ditto with the Guard robots. Since they don't talk, it's difficult to dodge Gamma's [[TakingYouWithMe "Recovery" Mode]] with no audible cue.
** The fight with Rouge where Emerl has to get 10 [=KOs=] without using any special moves. It can be somewhat mitigated with a good setup however. If you have the Character Combos from the final chapter, the game will not count these certain ones as special moves.
** The Sonic and Shadow fight before the final chapter. Sonic and Shadow, who have huge handicaps to make them competent fighters, against an Emerl player who's still trying to find the perfect moveset to stick with. ''Not even the unlockable combo attacks will guarantee a kill.''
** The first fight against Knuckles as Emerl can be this. At this point of the game, you'll have very few skill points for Emerl to use many skill cards for attacks. Many of Emerl's attacks will be slow and weak. And depending on how you arranged your skill cards, he won't be able to jump that high, or his movement could be incredibly slow. This definitely makes things a challenge when fighting the powerful and fairly quick Knuckles.