In The Legend of Zelda: Breath of the Wild, finding Korok seeds scattered across all of Hyrule helps upgrade your inventory with additional space. However, there is also a special prize that the Korok Hetsu will give to you if you manage to complete the massive task of helping him find all 900 Korok seeds in the game. [Thanks, Kotaku.]
Those curious about what the special reward is can check it out in the following video.
— FateAwaits (@Fateawaits520) March 14, 2017
The Legend of Zelda: Breath of the Wild is available for the Wii U and the Nintendo Switch.