Co-op climbing game, PEAK, was one of the biggest breakout hits of 2025, selling 2 million copies in its first two days and over 10 million copies within months – not bad for a title that a few devs built in a few weeks. 

Learn how the friends and devs from Landfall Games and Aggro Crab collaborated to iterate quickly and create an instant classic.

[0:00] - Introduction
[0:24] - Going higher together 
[0:55] - Finding fun faster with friends
[2:18] - Making social games

Play PEAK: https://on.unity.com/PEAK

The Unity Blog offers insights, tutorials, and updates on Unity, a popular game engine used for building interactive experiences across various platforms. Covering topics such as game development, virtual reality, and augmented reality, the blog provides resources for game developers and creators. Developers can learn how to use Unity's features, tools, and APIs to build immersive games, simulations, and interactive experiences.

Unity

Two indie game studios (Landfall and Araq) collaborated to build PEAK, a co-op climbing game, in just a few weeks during a month-long game jam in Korea. Seven developers worked together in an Airbnb, rapidly iterating through daily work sessions and evening playtests. The game unexpectedly became a viral success, growing daily as players invited friends. The teams focused on creating a social experience that facilitates hanging out with friends rather than complex systems or mechanics, a design philosophy they plan to carry into future multiplayer games.

How two small teams built PEAK in a few weeks

<p>Me and a friend of mine tried this game. Man, we’re so bad at it. 🤣</p>
