New York (CNN Business) Nintendo's popular Switch game "The Legend of Zelda: Breath of the Wild" is getting a sequel.

In an hour-long preview of upcoming games at the E3 video game conference in Los Angeles on Tuesday, Nintendo saved the biggest surprise for last. It showed a seconds-long trailer for the new Zelda game, saying it is "now in development." Nintendo didn't say when it would release the video game.

The trailer didn't reveal much. It featured green fire, a darkly lit lake and looks of astonishment on the characters' faces. But the fact that Nintendo is working on a sequel to one of its best-received games should be enough to give fans something to get excited about.

The first Zelda game for the Switch was a huge hit. Nintendo sold nearly 13 million copies worldwide of "The Legend of Zelda: Breath of the Wild," putting it in fourth place for Switch game sales, behind "Mario Kart 8 Deluxe," "Super Mario Odyssey" and "Super Smash Bros. Ultimate."

In the complex original game, players cook forest food and solve puzzles to unlock shrines. The land is full of beasts, monsters and machines. Players have to conquer them to save the kingdom.

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