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

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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>


<p>This is the most awesome co-op game I have ever played. Recommended.</p>
