ArenaGrade.cs
using Sandbox;
namespace PaintballBaddies;

// The per-arena colour grade was removed at the creator's request; each
// map's own lighting and tonemapping are used unchanged. This stub removes
// any grade component that an already-running scene may still hold.
public sealed class ArenaGrade : Component
{
    protected override void OnStart()
    {
        foreach(var go in Scene.GetAllObjects(false).Where(g=>g.Name=="Arena colour grade").ToArray())go.Destroy();
        Destroy();
    }
}