diff --git a/gamestate.cpp b/gamestate.cpp
index 169c9b7..0446936 100644
--- a/gamestate.cpp
+++ b/gamestate.cpp
@@ -48,6 +48,9 @@ void GameState::dealCards()
     m_foundation.clear();
     m_throwawayPile.clear();
 
+    // Note that we don't need to reset gameWon from here, as it's
+    // auto-checked from onFoundationChanged, which the emits trigger
+
     emit drawPileChanged();
     emit throwawayPileChanged();
     emit columnsChanged();
@@ -165,6 +168,28 @@ bool GameState::moveColumnCardToFoundation(int columnId, PlayingCard::Suit found
 
 }
 
+void GameState::onFoundationChanged()
+{
+    // Check if the game is won (can only happen on a foundation pile change)
+    bool gameWon = true;
+    for (const QList<PlayingCard*> &foundationPile : std::as_const(m_foundation)) {
+        // The piles need to contain all 13 card values each, otherwise the game isn't won
+        if (foundationPile.size() != 13) {
+            gameWon = false;
+            break;
+        }
+    }
+
+    if (gameWon == m_gameWon)
+        return;
+
+    if (gameWon)
+        qDebug() << "The game was won!";
+
+    m_gameWon = gameWon;
+    emit gameWonChanged();
+}
+
 bool GameState::tryMoveCardToFoundation(PlayingCard::Suit foundationId, PlayingCard* cardToMove)
 {
     assert(foundationId >= PlayingCard::Suit::Clubs && foundationId < PlayingCard::Suit::Spades);
@@ -234,3 +259,8 @@ QList<QList<PlayingCard *> > GameState::foundation() const
 {
     return m_foundation;
 }
+
+bool GameState::gameWon() const
+{
+    return m_gameWon;
+}
diff --git a/gamestate.h b/gamestate.h
index 944814c..8ed45c8 100644
--- a/gamestate.h
+++ b/gamestate.h
@@ -12,6 +12,7 @@ class GameState : public QObject
     Q_PROPERTY(QList<PlayingCard*> throwawayPile READ throwawayPile NOTIFY throwawayPileChanged)
     Q_PROPERTY(QList<QList<ColumnSlot*>> columns READ columns NOTIFY columnsChanged)
     Q_PROPERTY(QList<QList<PlayingCard*>> foundation READ foundation NOTIFY foundationChanged)
+    Q_PROPERTY(bool gameWon READ gameWon NOTIFY gameWonChanged)
 
 public:
     explicit GameState(QObject *parent = nullptr);
@@ -20,6 +21,7 @@ public:
     QList<PlayingCard*> throwawayPile() const;
     QList<QList<ColumnSlot*>> columns() const;
     QList<QList<PlayingCard*>> foundation() const;
+    bool gameWon() const;
 
     void dealCards();
     void drawNextCard();
@@ -32,12 +34,17 @@ signals:
     void throwawayPileChanged();
     void columnsChanged();
     void foundationChanged();
+    void gameWonChanged();
+
+private slots:
+    void onFoundationChanged();
 
 private:
     QList<PlayingCard*> m_drawPile;
     QList<PlayingCard*> m_throwawayPile;
     QList<QList<ColumnSlot*>> m_columns;
     QList<QList<PlayingCard*>> m_foundation;
+    bool m_gameWon;
 
     bool tryMoveCardToFoundation(PlayingCard::Suit foundationId, PlayingCard* cardToMove);
     void ensureColumnRevealed(int columnId);