+[**Glacier**](https://ioi.dk/glacier) is a proprietary in-house game engine developed by IO Interactive, known for being used in all of their main [HITMAN games](/franchise/HITMAN/) since the release of Hitman: Codename 47 in 2000. The engine was completely overhauled in 2012 for use in Hitman: Absolution and all of their future games, the new version being known as **Glacier 2**.
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