Unity + C# (Unity 6 LTS)

Idiomatic C# for the current Unity engine — 2D and 3D. Owns engine-side patterns (components, lifecycle, prefabs, scenes, data, input, async, builds). Not Godot (godot) or Unreal (unreal); stops at the netcode wire (gamedev-multiplayer).

Version contract — read first

Target: Unity 6 LTS, versioned 6000.x. Current LTS at authoring is Unity 6.3 LTS (6000.3) (supported to Dec 2027); Unity 6.0 LTS (6000.0) to Oct 2026. Unity 6 dropped the year-based names (2020/2021/2022 LTS) for the 6000.x scheme. Confirm the project version in ProjectSettings/ProjectVersion.txt before assuming an API exists.

Ban-list — never emit these; use the modern replacement: