Nightmare Mode is, as you know, reduced

+ enemies are fast from the beginning + "QUICK" and fireball come a lot faster. Tornade Mode is just a slower

, a bit faster than Nightmare Mode tho, but without all the other difficulty enhancing effects.
To get

Tornade Mode isn't enough, you need to use NM; you can use TM for an extra bit of speed tho, which is pretty helpful when trying to evade fireballs and stuff.
