diff --git a/src/main/java/de/hsfulda/onses/services/GameService.java b/src/main/java/de/hsfulda/onses/services/GameService.java
new file mode 100644
index 0000000..bdee4d5
--- /dev/null
+++ b/src/main/java/de/hsfulda/onses/services/GameService.java
@@ -0,0 +1,37 @@
+package de.hsfulda.onses.services;
+
+import de.hsfulda.onses.models.Card;
+import de.hsfulda.onses.models.Game;
+import de.hsfulda.onses.models.Player;
+
+public class GameService {
+    private final Game game;
+    public GameService(Game game) {
+        this.game = game;
+    }
+    public GameService() {
+        this(new Game());
+    }
+
+    public Game getGame() {
+        return game;
+    }
+
+    public void playCard(Player player, Card card)
+    {
+     // add lastPlayedCard back to drawCardDeck
+         game.setLastPlayedCard(card);
+     // check for special rules (draw, colorchoose, skip,...)
+    }
+
+    public boolean legalMove(Player player, Card card)
+    {
+        boolean legalMoveFound = false;
+        Card lastCard = game.getLastPlayedCard();
+        // rules:
+        if (card.getColor() == lastCard.getColor()) legalMoveFound = true; // same color
+
+        return legalMoveFound;
+    }
+
+}
diff --git a/src/test/java/de/hsfulda/onses/GameServiceTest.java b/src/test/java/de/hsfulda/onses/GameServiceTest.java
new file mode 100644
index 0000000..8a22108
--- /dev/null
+++ b/src/test/java/de/hsfulda/onses/GameServiceTest.java
@@ -0,0 +1,67 @@
+
+package de.hsfulda.onses;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+import de.hsfulda.onses.models.Card;
+import de.hsfulda.onses.models.Player;
+import de.hsfulda.onses.services.GameService;
+
+public class GameServiceTest {
+    @Test
+    @DisplayName("playCardRedEight")
+    public void playCardRedEight() {
+        // arrange
+        Card input = new Card().setColor(Card.Color.RED).setValue(Card.Value.EIGHT);
+        // act
+        GameService gameService = new GameService();
+        gameService.playCard(new Player(), input);
+        Card answer = gameService.getGame().getLastPlayedCard();
+        // assert
+        assertEquals(input, answer);
+    }
+    @Test
+    @DisplayName("playCardBlackChoose")
+    public void playCardBlackChoose() {
+        // arrange
+        Card input = new Card().setColor(Card.Color.BLACK).setValue(Card.Value.CHOOSE);
+        // act
+        GameService gameService = new GameService();
+        gameService.playCard(new Player(), input);
+        Card answer = gameService.getGame().getLastPlayedCard();
+        // assert
+        assertEquals(input, answer);
+    }
+
+    @Test
+    @DisplayName("legalMoveSameColorRed")
+    public void legalMoveSameColorRed() {
+        // arrange
+        Card input = new Card().setColor(Card.Color.RED).setValue(Card.Value.TWO);
+        boolean expected = true;
+        // act
+        GameService gameService = new GameService();
+        gameService.getGame().setLastPlayedCard(new Card().setColor(Card.Color.RED).setValue(Card.Value.FIVE));
+
+        boolean answer = gameService.legalMove(new Player(), input);
+        // assert
+        assertEquals(expected, answer);
+    }
+    @Test
+    @DisplayName("legalMoveSameColorBlue")
+    public void legalMoveSameColorBlue() {
+        // arrange
+        Card input = new Card().setColor(Card.Color.BLUE).setValue(Card.Value.THREE);
+        boolean expected = true;
+        // act
+        GameService gameService = new GameService();
+        gameService.getGame().setLastPlayedCard(new Card().setColor(Card.Color.BLUE).setValue(Card.Value.ONE));
+
+        boolean answer = gameService.legalMove(new Player(), input);
+        // assert
+        assertEquals(expected, answer);
+    }
+
+}