diff --git a/engines/grim/gfx_opengl.cpp b/engines/grim/gfx_opengl.cpp
index 55821341541..d6dbef8fcec 100644
--- a/engines/grim/gfx_opengl.cpp
+++ b/engines/grim/gfx_opengl.cpp
@@ -851,7 +851,7 @@ void GfxOpenGL::drawSprite(const Sprite *sprite) {
 		glLoadMatrixd(modelview);
 	}
 
-	if (sprite->_blendMode == Sprite::BlendAdditive) {
+	if (sprite->_flags1 & Sprite::BlendAdditive) {
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 	} else {
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@@ -859,14 +859,14 @@ void GfxOpenGL::drawSprite(const Sprite *sprite) {
 
 	glDisable(GL_LIGHTING);
 
-	if (sprite->_alphaTest) {
+	if (sprite->_flags2 & Sprite::AlphaTest) {
 		glEnable(GL_ALPHA_TEST);
 		glAlphaFunc(GL_GEQUAL, g_grim->getGameType() == GType_MONKEY4 ? 0.1f : 0.5f);
 	} else {
 		glDisable(GL_ALPHA_TEST);
 	}
 
-	if (sprite->_writeDepth) {
+	if (sprite->_flags2 & Sprite::DepthTest) {
 		glEnable(GL_DEPTH_TEST);
 	} else {
 		glDisable(GL_DEPTH_TEST);
diff --git a/engines/grim/gfx_opengl_shaders.cpp b/engines/grim/gfx_opengl_shaders.cpp
index 945863a90d4..79557599233 100644
--- a/engines/grim/gfx_opengl_shaders.cpp
+++ b/engines/grim/gfx_opengl_shaders.cpp
@@ -970,7 +970,7 @@ void GfxOpenGLS::drawSprite(const Sprite *sprite) {
 		glDepthMask(GL_FALSE);
 	}
 
-	if (sprite->_blendMode == Sprite::BlendAdditive) {
+	if (sprite->_flags1 & Sprite::BlendAdditive) {
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 	} else {
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@@ -978,7 +978,7 @@ void GfxOpenGLS::drawSprite(const Sprite *sprite) {
 
 	// FIXME: depth test does not work yet because final z coordinates
 	//        for Sprites and actor textures are inconsistently calculated
-	if (sprite->_writeDepth || _currentActor->isInOverworld()) {
+	if (sprite->_flags2 & Sprite::DepthTest || _currentActor->isInOverworld()) {
 		glEnable(GL_DEPTH_TEST);
 	} else {
 		glDisable(GL_DEPTH_TEST);
@@ -1000,7 +1000,7 @@ void GfxOpenGLS::drawSprite(const Sprite *sprite) {
 	_spriteProgram->setUniform("textured", GL_TRUE);
 	_spriteProgram->setUniform("isBillboard", GL_TRUE);
 	_spriteProgram->setUniform("lightsEnabled", false);
-	if (sprite->_alphaTest) {
+	if (sprite->_flags2 & Sprite::AlphaTest) {
 		_spriteProgram->setUniform("alphaRef", g_grim->getGameType() == GType_MONKEY4 ? 0.1f : 0.5f);
 	} else {
 		_spriteProgram->setUniform("alphaRef", 0.0f);
diff --git a/engines/grim/gfx_tinygl.cpp b/engines/grim/gfx_tinygl.cpp
index e64b1d8d4ee..fc4949df9e7 100644
--- a/engines/grim/gfx_tinygl.cpp
+++ b/engines/grim/gfx_tinygl.cpp
@@ -849,7 +849,7 @@ void GfxTinyGL::drawSprite(const Sprite *sprite) {
 		tglLoadMatrixf(modelview);
 	}
 
-	if (sprite->_blendMode == Sprite::BlendAdditive) {
+	if (sprite->_flags1 & Sprite::BlendAdditive) {
 		tglBlendFunc(TGL_SRC_ALPHA, TGL_ONE);
 	} else {
 		tglBlendFunc(TGL_SRC_ALPHA, TGL_ONE_MINUS_SRC_ALPHA);
@@ -857,14 +857,14 @@ void GfxTinyGL::drawSprite(const Sprite *sprite) {
 
 	tglDisable(TGL_LIGHTING);
 
-	if (sprite->_alphaTest) {
+	if (sprite->_flags2 & Sprite::AlphaTest) {
 		tglEnable(TGL_ALPHA_TEST);
 		tglAlphaFunc(TGL_GEQUAL, g_grim->getGameType() == GType_MONKEY4 ? 0.1f : 0.5f);
 	} else {
 		tglDisable(TGL_ALPHA_TEST);
 	}
 
-	if (sprite->_writeDepth) {
+	if (sprite->_flags2 & Sprite::DepthTest) {
 		tglEnable(TGL_DEPTH_TEST);
 	} else {
 		tglDisable(TGL_DEPTH_TEST);
diff --git a/engines/grim/sprite.cpp b/engines/grim/sprite.cpp
index e68de633c6f..d294ee109f9 100644
--- a/engines/grim/sprite.cpp
+++ b/engines/grim/sprite.cpp
@@ -31,8 +31,8 @@
 namespace Grim {
 
 Sprite::Sprite() :
-		_width(0), _height(0), _visible(false), _material(nullptr), _next(nullptr), _blendMode(BlendNormal),
-		_writeDepth(true), _alphaTest(true) {
+		_width(0), _height(0), _visible(false), _material(nullptr), _next(nullptr),
+		_flags1(0), _flags2(0) {
 }
 
 
@@ -65,13 +65,7 @@ void Sprite::loadBinary(Common::SeekableReadStream *stream, EMICostume *costume)
 	uint32 texnamelength = stream->readUint32LE();
 	char *texname = new char[texnamelength];
 	stream->read(texname, texnamelength);
-	stream->readByte(); // Unknown
-	byte blendMode = stream->readByte();
-	if (blendMode == 4)
-		_blendMode = BlendAdditive;
-	else if (blendMode != 0)
-		warning("Unknown blend mode value %d for sprite %s", blendMode, name);
-	stream->skip(2); // Unknown
+	_flags1 = stream->readUint32LE();
 	char data[20];
 	stream->read(data, sizeof(data));
 	_width = get_float(data);
@@ -90,11 +84,7 @@ void Sprite::loadBinary(Common::SeekableReadStream *stream, EMICostume *costume)
 		stream->read(f, 4);
 		_texCoordY[i] = get_float(f);
 	}
-	stream->readByte(); // Unknown (seems to always be 4)
-	if (stream->readByte() == 2)
-		_writeDepth = false;
-	if (stream->readByte() < 2)
-		_alphaTest = false;
+	_flags2 = stream->readUint32LE();
 
 	_material = costume->loadMaterial(texname, true);
 	_next = nullptr;
diff --git a/engines/grim/sprite.h b/engines/grim/sprite.h
index 51890962826..c431c1153a7 100644
--- a/engines/grim/sprite.h
+++ b/engines/grim/sprite.h
@@ -38,9 +38,12 @@ class EMICostume;
 
 class Sprite {
 public:
-	enum BlendMode {
-		BlendNormal = 0,
-		BlendAdditive = 1
+	enum SpriteFlags1 {
+		BlendAdditive = 0x400
+	};
+	enum SpriteFlags2 {
+		DepthTest = 0x100,
+		AlphaTest = 0x20000
 	};
 
 	Sprite();
@@ -54,15 +57,14 @@ public:
 	bool _visible;
 	Material *_material;
 	Sprite *_next;
-	BlendMode _blendMode;
+	uint32 _flags1;
 	int _red[4];
 	int _green[4];
 	int _blue[4];
 	int _alpha[4];
 	float _texCoordX[4];
 	float _texCoordY[4];
-	bool _writeDepth;
-	bool _alphaTest;
+	uint32 _flags2;
 };
 
 } // end of namespace Grim