diff --git a/doc.go b/doc.go
index ccc33c2d8..3715e4f81 100644
--- a/doc.go
+++ b/doc.go
@@ -81,10 +81,6 @@
 //	"warp":  Use WARP (i.e. software rendering).
 //	"debug": Use a debug layer.
 //
-// `EBITENGINE_DIRECTX_FEATURE_LEVEL` environment variable specifies DirectX feature level.
-// The possible values are "11_0", "11_1", "12_0", "12_1", and "12_2".
-// The default value is "11_0".
-//
 // # Build tags
 //
 // `ebitenginedebug` outputs a log of graphics commands. This is useful to know what happens in Ebitengine. In general, the
diff --git a/internal/graphicsdriver/directx/api_windows.go b/internal/graphicsdriver/directx/api_windows.go
index 75961dcad..36af5160a 100644
--- a/internal/graphicsdriver/directx/api_windows.go
+++ b/internal/graphicsdriver/directx/api_windows.go
@@ -76,10 +76,6 @@ type _D3D_FEATURE_LEVEL int32
 
 const (
 	_D3D_FEATURE_LEVEL_11_0 _D3D_FEATURE_LEVEL = 0xb000
-	_D3D_FEATURE_LEVEL_11_1 _D3D_FEATURE_LEVEL = 0xb100
-	_D3D_FEATURE_LEVEL_12_0 _D3D_FEATURE_LEVEL = 0xc000
-	_D3D_FEATURE_LEVEL_12_1 _D3D_FEATURE_LEVEL = 0xc100
-	_D3D_FEATURE_LEVEL_12_2 _D3D_FEATURE_LEVEL = 0xc200
 )
 
 type _D3D_PRIMITIVE_TOPOLOGY int32
diff --git a/internal/graphicsdriver/directx/graphics_windows.go b/internal/graphicsdriver/directx/graphics_windows.go
index 1c94b8e5e..daf019882 100644
--- a/internal/graphicsdriver/directx/graphics_windows.go
+++ b/internal/graphicsdriver/directx/graphics_windows.go
@@ -181,24 +181,6 @@ func (g *Graphics) initialize() (ferr error) {
 		}
 	}
 
-	// Specify the level 11 by default.
-	// Some old cards don't work well with the default feature level (#2447, #2486).
-	var featureLevel _D3D_FEATURE_LEVEL = _D3D_FEATURE_LEVEL_11_0
-	if env := os.Getenv("EBITENGINE_DIRECTX_FEATURE_LEVEL"); env != "" {
-		switch env {
-		case "11_0":
-			featureLevel = _D3D_FEATURE_LEVEL_11_0
-		case "11_1":
-			featureLevel = _D3D_FEATURE_LEVEL_11_1
-		case "12_0":
-			featureLevel = _D3D_FEATURE_LEVEL_12_0
-		case "12_1":
-			featureLevel = _D3D_FEATURE_LEVEL_12_1
-		case "12_2":
-			featureLevel = _D3D_FEATURE_LEVEL_12_2
-		}
-	}
-
 	// Initialize not only a device but also other members like a fence.
 	// Even if initializing a device succeeds, initializing a fence might fail (#2142).
 
@@ -207,15 +189,14 @@ func (g *Graphics) initialize() (ferr error) {
 			return err
 		}
 	} else {
-		if err := g.initializeDesktop(useWARP, useDebugLayer, featureLevel); err != nil {
+		if err := g.initializeDesktop(useWARP, useDebugLayer); err != nil {
 			return err
 		}
 	}
-
 	return nil
 }
 
-func (g *Graphics) initializeDesktop(useWARP bool, useDebugLayer bool, featureLevel _D3D_FEATURE_LEVEL) (ferr error) {
+func (g *Graphics) initializeDesktop(useWARP bool, useDebugLayer bool) (ferr error) {
 	if err := d3d12.Load(); err != nil {
 		return err
 	}
@@ -282,7 +263,7 @@ func (g *Graphics) initializeDesktop(useWARP bool, useDebugLayer bool, featureLe
 				continue
 			}
 			// Test D3D12CreateDevice without creating an actual device.
-			if _, err := _D3D12CreateDevice(unsafe.Pointer(a), featureLevel, &_IID_ID3D12Device, false); err != nil {
+			if _, err := _D3D12CreateDevice(unsafe.Pointer(a), _D3D_FEATURE_LEVEL_11_0, &_IID_ID3D12Device, false); err != nil {
 				continue
 			}
 
@@ -295,7 +276,7 @@ func (g *Graphics) initializeDesktop(useWARP bool, useDebugLayer bool, featureLe
 		return errors.New("directx: DirectX 12 is not supported")
 	}
 
-	d, err := _D3D12CreateDevice(unsafe.Pointer(adapter), featureLevel, &_IID_ID3D12Device, true)
+	d, err := _D3D12CreateDevice(unsafe.Pointer(adapter), _D3D_FEATURE_LEVEL_11_0, &_IID_ID3D12Device, true)
 	if err != nil {
 		return err
 	}