10 Pokémon FireRed & LeafGreen Secrets That Made Kanto Feel Much Bigger Than It Was

GameFreak's Pokémon FireRed & LeafGreen didn't just arrive as simple graphical updates to the beloved original Pokémon games — they delivered a fresh and surprisingly modern, even today, experience that gave fans everything they loved about Kanto as well as just that little bit extra.

Featuring new-at-the-time Abilities, Pokémon moves, design philosophies, and features, Pokémon FireRed & LeafGreen took fans back to what's still a fan-favorite region and made it feel like a whole new experience. When we played FireRed & LeafGreen, it wasn't just a simple rehash; the world felt full, alive, and bigger than it ever had before.

10 The Mystery of the SS Anne Truck

There's Got to be a Mew There, Right?

The SS Anne Truck will go down in video game history as one of the most infamous video game secrets of all time. When I was kid (and I'm dating myself here!), the potential for finding a secret Mew in Red and Blue was the biggest playground rumor around. It was so tempting to believe, since there was this entire area hidden behind the SS Anne you could only find if you somehow got Cut and Surf before the SS Anne departed Kanto.

Obviously, it was just a hidden area with no actual secrets included. Realistically, in-world, it's just a loading area for the ship, and it gives a little sense of the logistics required for hosting a cruise ship in port. But it makes Kanto feel like it's simply bursting with secrets, and that makes the world feel just that little bit bigger.

9 Altering Cave

The Mystery of the Cave that Does Nothing

Altering Cave was one of FireRed & LeafGreen's weirdest places. As far as we could tell back in the day, it didn't do anything at all! There was no explanation available for it for most of us, since Internet fan spaces weren't as easily accessible as they are today. It was meant to be used for special-event distribution, which would have "altered" the Pokémon encounters in the cave, giving players access to Pokémon like Mareep or Shuckle instead of the Zubat usually found there.

Unfortunately, this didn't happen, so the cave is just a mysterious but somewhat boring cave filled with Zubat you can basically just ignore. But its inclusion in the final game fueled endless speculation about what it was for, why it was there, and whether there was any additional secret attached to it. It's a great example of how a simple mystery can make the world feel so much bigger, since there was always the possibility that Altering Cave did something you just hadn't discovered yet.

8 Kanto Has Cities, Not Levels

Real Places Doing Real Things

FireRed & LeafGreen feel like they take place in a living region with a past, rather than a series of story events in a theme-park-type world. Throughout the game, players discover things that happened long before they came on the scene. Places like the Pewter Museum allude to historical events, and we can even find fossils in Mt. Moon.

Other places in Kanto seem to have specific purposes, too, mirroring real-world towns and cities. Vermillion City is a bustling port; Saffron City is a tech metropolis; Celadon City is a city of commerce and tourism. All these little details make Kanto feel like a real place with its own stuff going on. It feels less like a series of levels designed around a story and more like a real place where a story is happening; it has its own sense of scale.

7 Pokémon Tower and Mr Fuji

The World has Personal and Cultural Depth

Pokémon Tower reveals a deeper side of life in Kanto by offering a dedicated space for people to remember deceased Pokémon. This is a nice cultural touch because it shows that people in Kanto have lives and concerns completely unrelated to whatever we've got going on, making the world feel bigger.

But even where Pokémon Tower intersects with the player's personal journey, it does so in a way that expands the scale of the world. We see Mr Fuji as a man with multiple responsibilities and a life beyond his role in our story, giving necessary cultural depth instead of behaving as a simply NPC with a quest. This makes the world feel so much larger.

6 Ancient Mysteries of the Sevii Islands

The Sevii Islands are filled with locations that hint at deep cultural and historical mysteries, without letting us step in and immediately solve them. This instantly gives us a sense of mystery and historical weight that mirrors many real-world mysteries. Locations like the Tanoby Ruins with chambers where we can find Unown, or the Dotted Hole and its braille puzzle, are places the player can engage with and extract secrets... but the overall mystery is still there.

We don't know who built them or why, and that's okay. The existence of these little mysteries, which were there long before we arrived and persist long after we interact with them, makes us feel like we're engaging with a small piece of a much larger world.

5 Team Rocket's Return

We Aren't the Center of the World

FireRed & LeafGreen's post-game is a fantastic piece of storytelling because it allows the main conflict to continue after we become Champion, but in a way that doesn't feel like it invalidates our success. Even though we've defeated Giovanni, it's believable that the organization is still up to no good beyond the Kanto mainland. And it makes sense too, because we know that Team Rocket is still operating in Johto.

When I found this out the first time I played, it was a major bombshell because I just wasn't expecting it at all. I was a little bit annoyed, actually, since I'd already defeated them! But looking back, it's a great post-game secret precisely because it's believable and a little frustrating. More importantly, it makes the world feel persistent and larger, because there are things going on according to pre-existing priorities and motivations that just didn't involve us as players.

What Do You Mean That Was Always Just There?

The original Red and Blue had fantastic optional dungeons available to players who stepped off the beaten track, and FireRed & LeafGreen dutifully included these. Places like the Power Plant, which were completely optional, rewarded backtracking and exploration with powerful Legendary Pokémon that couldn't be found anywhere else.

Optional locations such as the Lost Cave and Seafoam Islands reward exploration, making Kanto feel just that little bit bigger. Many players don't ever visit these hidden optional dungeons — I remember telling my niece about the Power Plant, since she'd never seen it before. When you find them, though, it makes you wonder "What else is there?"

3 Mewtwo's Hidden Lore

Hidden Science Cabals and Secretive Experiments Expand the World

Mewtwo's hidden lore inside the abandoned Pokémon Mansion on Cinnabar Island hides an important part of Kanto's history from the world. Compared with some modern entries into the Pokémon franchise, Mewtwo's lore can feel a little bit basic. Next to the gods of space and time, and the Pokémon world god itself, "Cloned from Mew" is a little mundane.

But from a story and setting perspective, finding the hidden journal entries makes the Kanto region feel alive, especially since Mewtwo has literally nothing to do with the main story or the player's actions in the game world. It makes Kanto feel like a place where real things are happening that have literally nothing to do with us. Until we actually find Mewtwo ourselves, these journals feel like a tantalizing glimpse at a history that long predates our arrival.

2 Cerulean Cave

Hidden in Plain Sight

Cerulean Cave is a secret hidden in plain sight, since we can tell there's something there from very early in the game. We know it's hiding something — we just don't know what — or how to get a look inside it. We have to wait until the very end of the main story before we get a chance, and when we do, we discover some of the strongest and rarest Pokémon in Kanto.

It's even hiding Mewtwo, the strongest Legendary Pokémon in Kanto and a Pokémon we've only ever seen scattered references to if we did a little bit of exploration. It makes us feel like we've just scratched the surface. In both FireRed & LeafGreen, Cerulean Cave is the final dungeon we get to experience in the games, containing the very last secret available to us. It makes us feel like there's always one last secret to find.

1 The Sevii Islands

Literally Making Kanto Bigger

For first timers to FireRed & LeafGreen, the Sevii Islands are the ultimate secret that makes Kanto feel larger... because they literally make Kanto larger. When I first played, I was shocked to find the Sevii Islands. An entirely new area? It was almost like finding Kanto after beating the League in Gold and Silver!

Then the Sevii Islands come with their own story and sense of progression, too, making them feel even larger than they are. They've even got their very own secrets and optional areas, and they completely change our understanding of Kanto and its place in the Pokémon world. They feel like a secret discovery even in the Switch rerelease, since they've never appeared in any other game.