The Big Game Engine Report of 2025
The Big Game Engine Report 2025 examines the shifting landscape of game development technology, focusing on the transition from proprietary in-house tools to third-party public engines. The analysis covers over 13,000 games released on Steam, tracking market share trends from 2012 through 2024 with projections reaching 2030. Findings are based on proprietary estimations and tagging methodologies that categorize engines into three tiers: dominant public engines (Unity and Unreal), smaller public engines (Godot, GameMaker, RPG Maker), and custom in-house engines used by major AAA studios.
The central thesis posits that the era of dominant in-house engines is ending as major studios increasingly adopt Unreal Engine 5 to reduce maintenance costs and access a broader talent pool. While custom engines powered over 70% of Steam releases in 2012, they accounted for only 13% of releases in 2024. In terms of commercial performance, custom engines still represent 42% of units sold, but this is the first time they have fallen below the 50% threshold. Unreal Engine has capitalized on this shift, particularly in the AAA space, while Unity remains the leader in sheer volume, powering 51% of all 2024 releases.
The data highlights a clear correlation between game size and engine choice. Unity dominates the "Tiny" and "Small" categories (under 100k units), whereas custom engines and Unreal Engine control the "Large" segment (over 1M units). Emerging trends show Godot as the fastest-growing smaller engine, driving over two-thirds of the growth in its tier since 2020. Looking forward, the industry expects a continued migration toward Unreal Engine 5, with Unity projected to face increasing pressure from open-source alternatives like Godot in the indie sector while struggling to gain further ground in the high-end AAA market.
Video Game InsightsJan 2025