This is the 6634th most frequent Japanese word.
ナニソレ
"ナニソレ" means "What’s that?" or "What do you mean?" and is often used to express surprise, confusion, or curiosity.
Used to express surprise or curiosity about an unfamiliar concept or information.
ナニソレ、そんな話を聞いたことがない。
What is that, I've never heard such a story.
Used here to express interest and seek more information about the mentioned game.
新しいゲームが出た？ナニソレ、面白そう。
A new game came out? What is that, sounds interesting.
The phrase is used as an informal interjection expressing surprise or reaction to something unexpected.