To be brief: The Wii, 3DS and Wii U version are all the same game with slightly different graphics, same game, same layouts of the levels etc. But the DS version is vastly different in both character movesets and level layouts, making it uncomparable to for example the Wii version. For example, Arcee's aerial melee is essentially a rocketboost forward, you go so far with it, it's absurd. And then for different layouts, in the Wii version you chase Arachnid(the helicopter) up to a certain point, where a cutscene triggers and the level ends. In the DS version you have to jump over obstacles and contantly shoot Arachnid until you actually defeat her, there is no distance trigger. Also some bossfights go very differently, attacks that are exclusive to the DS version are not present in others, for example the big purple wall that Arachnid attacks you with in the second bossfight is missing. The versions are vastly different, so they should be in different categories. I know nobody is running the game but it still makes me upset that they aren't seperated. If you want video proof of the differences I will edit this and provide links.