diff --git a/src/ProjectPlayer.qml b/src/ProjectPlayer.qml
index 5d12c3d..b0b200c 100644
--- a/src/ProjectPlayer.qml
+++ b/src/ProjectPlayer.qml
@@ -12,6 +12,7 @@ ProjectScene {
     property int stageWidth: 480
     property int stageHeight: 360
     readonly property bool running: loader.running
+    readonly property list<string> unsupportedBlocks: loader.unsupportedBlocks
     property alias fps: loader.fps
     property alias turboMode: loader.turboMode
 	property alias cloneLimit: loader.cloneLimit
diff --git a/src/projectloader.cpp b/src/projectloader.cpp
index 6344911..cc6a3ee 100644
--- a/src/projectloader.cpp
+++ b/src/projectloader.cpp
@@ -188,6 +188,11 @@ const QList<MonitorModel *> &ProjectLoader::monitorList() const
     return m_monitors;
 }
 
+const QStringList &ProjectLoader::unsupportedBlocks() const
+{
+    return m_unsupportedBlocks;
+}
+
 void ProjectLoader::start()
 {
     if (m_loadThread.isRunning())
@@ -300,6 +305,15 @@ void ProjectLoader::load()
         return;
     }
 
+    // Get unsupported blocks
+    const auto &unsupportedBlocks = m_engine->unsupportedBlocks();
+    m_unsupportedBlocks.clear();
+
+    for (const std::string &opcode : unsupportedBlocks)
+        m_unsupportedBlocks.push_back(QString::fromStdString(opcode));
+
+    emit unsupportedBlocksChanged();
+
     m_engineMutex.unlock();
 
     emit loadStatusChanged();
diff --git a/src/projectloader.h b/src/projectloader.h
index 286cade..a645afa 100644
--- a/src/projectloader.h
+++ b/src/projectloader.h
@@ -30,6 +30,7 @@ class ProjectLoader : public QObject
         Q_PROPERTY(QQmlListProperty<SpriteModel> sprites READ sprites NOTIFY spritesChanged)
         Q_PROPERTY(QQmlListProperty<SpriteModel> clones READ clones NOTIFY clonesChanged)
         Q_PROPERTY(QQmlListProperty<MonitorModel> monitors READ monitors NOTIFY monitorsChanged)
+        Q_PROPERTY(QStringList unsupportedBlocks READ unsupportedBlocks NOTIFY unsupportedBlocksChanged)
         Q_PROPERTY(double fps READ fps WRITE setFps NOTIFY fpsChanged)
         Q_PROPERTY(bool turboMode READ turboMode WRITE setTurboMode NOTIFY turboModeChanged)
         Q_PROPERTY(unsigned int stageWidth READ stageWidth WRITE setStageWidth NOTIFY stageWidthChanged)
@@ -65,6 +66,8 @@ class ProjectLoader : public QObject
         QQmlListProperty<MonitorModel> monitors();
         const QList<MonitorModel *> &monitorList() const;
 
+        const QStringList &unsupportedBlocks() const;
+
         Q_INVOKABLE void start();
         Q_INVOKABLE void stop();
 
@@ -105,6 +108,7 @@ class ProjectLoader : public QObject
         void spritesChanged();
         void clonesChanged();
         void monitorsChanged();
+        void unsupportedBlocksChanged();
         void fpsChanged();
         void turboModeChanged();
         void stageWidthChanged();
@@ -147,6 +151,7 @@ class ProjectLoader : public QObject
         QList<SpriteModel *> m_sprites;
         QList<SpriteModel *> m_clones;
         QList<MonitorModel *> m_monitors;
+        QStringList m_unsupportedBlocks;
         double m_fps = 30;
         bool m_turboMode = false;
         unsigned int m_stageWidth = 480;
diff --git a/test/projectloader/projectloader_test.cpp b/test/projectloader/projectloader_test.cpp
index d3414be..96ee1f2 100644
--- a/test/projectloader/projectloader_test.cpp
+++ b/test/projectloader/projectloader_test.cpp
@@ -32,6 +32,7 @@ class ProjectLoaderTest : public testing::Test
             QSignalSpy clonesSpy(loader, &ProjectLoader::clonesChanged);
             QSignalSpy monitorsSpy(loader, &ProjectLoader::monitorsChanged);
             QSignalSpy monitorAddedSpy(loader, &ProjectLoader::monitorAdded);
+            QSignalSpy unsupportedBlocksSpy(loader, &ProjectLoader::unsupportedBlocksChanged);
 
             loader->setFileName(fileName);
 
@@ -60,6 +61,7 @@ class ProjectLoaderTest : public testing::Test
             ASSERT_EQ(clonesSpy.count(), 1);
             ASSERT_EQ(monitorsSpy.count(), loader->monitorList().size() + 1);
             ASSERT_EQ(monitorAddedSpy.count(), loader->monitorList().size());
+            ASSERT_EQ(unsupportedBlocksSpy.count(), 1);
         }
 };
 
@@ -107,6 +109,25 @@ TEST_F(ProjectLoaderTest, Load)
     ASSERT_EQ(valueMonitorModel->color(), QColor::fromString("#FF8C1A"));
 }
 
+TEST_F(ProjectLoaderTest, UnsupportedBlocks)
+{
+    ProjectLoader loader;
+    ASSERT_TRUE(loader.fileName().isEmpty());
+    ASSERT_FALSE(loader.loadStatus());
+    ASSERT_TRUE(loader.stage());
+
+    loader.setFileName("unsupported_blocks.sb3");
+    loader.start(); // wait until it loads
+
+    auto engine = loader.engine();
+    const auto &blocks = loader.unsupportedBlocks();
+    const auto &refBlocks = engine->unsupportedBlocks();
+    ASSERT_EQ(blocks.size(), refBlocks.size());
+
+    for (const QString &opcode : blocks)
+        ASSERT_NE(refBlocks.find(opcode.toStdString()), refBlocks.cend());
+}
+
 TEST_F(ProjectLoaderTest, Clones)
 {
     ProjectLoader loader;
diff --git a/test/unsupported_blocks.sb3 b/test/unsupported_blocks.sb3
new file mode 100644
index 0000000..7098a65
Binary files /dev/null and b/test/unsupported_blocks.sb3 differ