Kingdom Hearts 3 will add Critical Mode difficulty in a free update coming tomorrow, April 23, Square Enix announced today. The news comes straight from series director Tetsuya Nomura, who said "we’ve changed things up from the previous games, so I hope you enjoy."
Critical Mode has appeared in several Kingdom Hearts games, and while it's always one of the hardest difficulty modes available, the exact rules for it have changed over the years. The basis is this: you take way more damage (usually double) and deal way less damage (as little as half). So no matter how Kingdom Hearts 3's Critical Mode plays out, it's going to be hard.
In Kingdom Hearts 2 Final Mix, for example, Critical Mode decreased EXP and MP earnings but increased some AP gains. And unlike most other games, it slightly increased the damage you deal while also doubling the damage you receive. Similarly, it gave you some abilities a bit earlier. So while it did make the game much harder overall, it also relaxed certain elements to keep the pace from plummeting.
Compare that to Kingdom Hearts Re:coded, which just straight-up doubled the damage you take and halved the damage you deal. Then there's Kingdom Hearts 3D: Dream Drop Distance, which made enemies flinch less often and increased the rate bosses use their strongest moves on top of fiddling with the damage. It'll be interesting to see how Kingdom Hearts 3 has "changed things up" for Critical Mode. In any case, if you loved the world and characters but you've been looking for a greater challenge, I'm sure it'll be hard.
Here are some Kingdom Hearts 3 tips to help you survive on all difficulties, along with the best Kingdom Hearts 3 keyblades to bring into battle.