There's a cute short intro animation for the game: Hololive Treasure Mountain, and it was PekoMari.
Hakui Koyori, Inugami Korone and Kaela Kovalskia tried to play the newly released game. It's like 3D Suika game with Hololive Members.

Source:
=========korone========
【祝☆発売】ホロライブお宝マウンテンやるぞおおおおおっ【戌神ころね】
https://www.youtube.com/live/nYgNIEGD...
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========koyori=========
【ホロライブお宝マウンテン】今日発売のholoIndie最新作3Dパズルゲーム！ぺこら先輩作れるまで終われまてん！？？？【博衣こより/ホロライブ】
https://www.youtube.com/live/UqzZJrEv...
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==========Kaela==========
【hololive Treasure Mountain】new game, cute game, fun game【Kaela Kovalskia / hololiveID】
https://www.youtube.com/live/pwL0CZA3...
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#hololive #vtuber #inugamikorone