diff --git a/tests/test_game_of_life.py b/tests/test_game_of_life.py
index e16b6327..abdc17ae 100644
--- a/tests/test_game_of_life.py
+++ b/tests/test_game_of_life.py
@@ -3,10 +3,33 @@ import pytest
 from reasoning_gym.algorithmic.game_of_life import GameOfLifeConfig, GameOfLifeDataset
 
 
-def test_game_of_life():
-    """Test basic properties and solution of generated items"""
+def test_game_of_life_config_validation():
+    """Test that invalid configs raise appropriate errors"""
+    with pytest.raises(AssertionError):
+        config = GameOfLifeConfig(grid_size_x=2)  # Too small
+        config.validate()
 
-    # Easy
+    with pytest.raises(AssertionError):
+        config = GameOfLifeConfig(grid_size_y=1000)  # Too large
+        config.validate()
+
+    with pytest.raises(AssertionError):
+        config = GameOfLifeConfig(grid_size_x=5, grid_size_y=5, filled_cells=26)  # Too many cells
+        config.validate()
+
+
+def test_game_of_life_deterministic():
+    """Test that dataset generates same items with same seed"""
+    config = GameOfLifeConfig(seed=42, size=10)
+    dataset1 = GameOfLifeDataset(config)
+    dataset2 = GameOfLifeDataset(config)
+
+    for i in range(len(dataset1)):
+        assert dataset1[i] == dataset2[i]
+
+
+def test_game_of_life_basic_properties():
+    """Test basic properties and solution of generated items"""
     config = GameOfLifeConfig(seed=42, size=10, grid_size_x=20, grid_size_y=20, filled_cells=200, simulation_steps=1)
     dataset = GameOfLifeDataset(config)
 
@@ -16,12 +39,34 @@ def test_game_of_life():
         assert "answer" in item
         assert "metadata" in item
 
-        # # Check metadata contains required fields
+        # Check metadata contains required fields
         assert "grid_size_x" in item["metadata"]
         assert "grid_size_y" in item["metadata"]
         assert "filled_cells" in item["metadata"]
         assert "simulation_steps" in item["metadata"]
 
-        # # Test the scoring
+        # Test the scoring
         assert dataset.score_answer(answer=item["answer"], entry=item) == 1.0
         assert dataset.score_answer(answer=None, entry=item) == 0.0
+        assert dataset.score_answer(answer="invalid json", entry=item) == 0.01
+
+
+def test_game_of_life_iteration():
+    """Test that iteration respects dataset size"""
+    config = GameOfLifeConfig(size=5, seed=42)  # Small size for testing
+    dataset = GameOfLifeDataset(config)
+
+    # Test manual iteration
+    items = []
+    for item in dataset:
+        items.append(item)
+    assert len(items) == config.size, "Iterator should yield exactly size items"
+
+    # Test list conversion
+    items = list(dataset)
+    assert len(items) == config.size, "Iterator should yield exactly size items"
+
+    # Test multiple iterations
+    first_items = list(dataset)
+    second_items = list(dataset)
+    assert first_items == second_items, "Multiple iterations should yield same items"