Secret Realms (时空秘境; pinyin: Shíkōng Mì Jìng) is a gamemode in the Chinese version of Plants vs. Zombies 2. It is similar to Adventure Mode with the primary distinction being that exclusive worlds don't have to follow the theming of a specific time period. These worlds contain a general boss, new zombies, new gimmicks, and new plants.
There are 2 types of difficulty in these realms: Easy and Hard. Levels on the hard difficulty can earn the player more rewards than the easy difficulty. Completing Secret Realm levels will result in the player earning earning rewards like plants and Puzzle Pieces.
The player can also use the zombies found in the Fairytale Forest in Creative Courtyard. And can even purchase things in the Secret rewards shop.