Key System

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The Key System menu

The Key System (Japanese: キーシステム Key System) is a feature of the Unova Link in Pokémon Black 2 and White 2. It allows players to change the difficulty level of the game, switch between Black City and White Forest, and change the Mystery Door in the Underground Ruins. They can be shared between players using the Unova Link, but players can only share the keys that are exclusive to their version.

Difficulty

For the first time in a Pokémon game, there are different difficulty levels. There are three different modes: Easy Mode (Japanese: アシストモード Assist Mode), Normal Mode (Japanese: ノーマルモード Normal Mode), and Challenge Mode (Japanese: チャレンジモード Challenge Mode). Only Normal Mode is unlocked by default; Easy Mode and Challenge Mode must be unlocked through the course of the games. Because they are unlocked only after defeating the Champion, the player must start a new game in order to play the main storyline with a different difficulty.

In Easy Mode, opponents use less competent artificial intelligence and the level of opposing Trainers' Pokémon are lower than usual. However, their Pokémon's stats are still calculated using the levels from Normal Mode; as such, many Trainer battles become slightly easier, but they provide less experience and prize money. The player is rewarded with the Easy Key (Japanese: アシストキー Assist Key) after defeating the Champion in Pokémon White 2.

In Challenge Mode, opponents use more competent artificial intelligence and the level of opposing Trainers' Pokémon are higher than usual (1 level higher at the start of the game, and rising to 5 levels higher by the end of the game). Gym Leaders and the Elite Four each use one additional Pokémon on their team, as well as their party having different movesets and held items, and their Pokémon's IVs are all set to 30. However, Trainers' Pokémon's stats are still calculated using the levels from Normal Mode. The player is rewarded with the Challenge Key (Japanese: チャレンジキー Challenge Key) after defeating the Champion in Pokémon Black 2.

To unlock Easy Mode in Black 2 and Challenge Mode in White 2, the respective keys for each version need to be transferred from a player with the opposite version via the Unova Link.

City

The version exclusive cities, Black City and White Forest, are found by default in Black Version 2 and White Version 2, respectively. They can be unlocked in the opposite game if certain conditions are met.

After completing the five areas of Black Tower in Black 2, the player will be rewarded with the Tower Key (Japanese: まてんろうのカギ Skyscraper Key). This can be transferred to White 2, which will unlock access to Black City. Likewise, after White 2 players have completed five areas of White Treehollow, the Treehollow Key (Japanese: じゅどうのカギ Tree Hollow Key) can be transferred to Black 2. This unlocks White Forest for Black 2 players.

Players of either version can use the Unova Link to switch between cities once both are unlocked. However, the cities cannot be switched if the player had saved their game within the current city.

Mystery Door

A mysterious door in the Clay Tunnel gives access to the Underground Ruins, where the Legendary titans can be found, though only one titan will appear at a time, depending on which key is active. Regirock is the default Pokémon in both Black 2 and White 2. Upon catching Regirock (and not just defeating it, fleeing from it or obtaining it from another game), Black 2 players are rewarded with the Iron Key (Japanese: くろがねのカギ Iron Key) and White 2 players with the Iceberg Key (Japanese: ひょうざんのカギ Iceberg Key); these allow access to Registeel and Regice, respectively. Players can obtain their final key by transferring it from the opposite version through Unova Link.

In other languages

Language Title
Denmark Flag.png Danish Nøglesystemet
France Flag.png French Trousseau
Germany Flag.png German Schlüsselsystem
Italy Flag.png Italian Sistema a chiave
South Korea Flag.png Korean 키 시스템 Key System
Spain Flag.png Spanish Sistema Clave
Sweden Flag.png Swedish Nyckelsystemet


Easy Mode

Language Title
France Flag.png French Mode assisté
Germany Flag.png German Hilfsmodus
Italy Flag.png Italian Modalità aiuto
South Korea Flag.png Korean 어시스트 모드 Assist Mode
Spain Flag.png Spanish Modo Ayuda

Normal Mode

Language Title
France Flag.png French Mode normal
Germany Flag.png German Standardmodus
Italy Flag.png Italian Modalità normale
South Korea Flag.png Korean 노말모드 Normal Mode
Spain Flag.png Spanish Modo Normal

Challenge Mode

Language Title
France Flag.png French Mode challenge
Germany Flag.png German Hürdenmodus
Italy Flag.png Italian Modalità ostacolo
South Korea Flag.png Korean 챌린지 모드 Challenge Mode
Spain Flag.png Spanish Modo Reto

Easy Key

Language Title
France Flag.png French Clé Assistance
Germany Flag.png German Hilfsschlüssel
Italy Flag.png Italian Chiave aiuto
South Korea Flag.png Korean 어시스트 키 Assist Key
Spain Flag.png Spanish Clave Ayuda

Challenge Key

Language Title
France Flag.png French Clé Challenge
Germany Flag.png German Hürdenschlüssel
Italy Flag.png Italian Chiave ostacolo
South Korea Flag.png Korean 챌린지 키 Challenge Key
Spain Flag.png Spanish Clave Reto

Tower Key

Language Title
France Flag.png French Clé Gratte-Ciel
Germany Flag.png German S-Schlüssel
Italy Flag.png Italian Chiave grattacielo
South Korea Flag.png Korean 마천루의 열쇠 Macheollu-ui Yeolsoe
Spain Flag.png Spanish Clave Rascacielos

Treehollow Key

Language Title
France Flag.png French Clé Arbre Creux
Germany Flag.png German W-Schlüssel
Italy Flag.png Italian Chiave antro
South Korea Flag.png Korean 수동의 열쇠 Sudong-ui Yeolsoe
Spain Flag.png Spanish Clave Cavernogal

Iron Key

Language Title
France Flag.png French Clé Fer
Germany Flag.png German Eisenschlüssel
Italy Flag.png Italian Chiave ferro
South Korea Flag.png Korean 쇠철의 열쇠 Soecheol-ui Yeolsoe
Spain Flag.png Spanish Clave Hierro

Iceberg Key

Language Title
France Flag.png French Clé Iceberg
Germany Flag.png German Eisbergschlüssel
Italy Flag.png Italian Chiave iceberg
South Korea Flag.png Korean 빙산의 열쇠 Bingsan-ui Yeolsoe
Spain Flag.png Spanish Clave Iceberg


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