diff --git a/solution/0500-0599/0511.Game Play Analysis I/README.md b/solution/0500-0599/0511.Game Play Analysis I/README.md
index 5ca0090658796..67a127298ceb5 100644
--- a/solution/0500-0599/0511.Game Play Analysis I/README.md	
+++ b/solution/0500-0599/0511.Game Play Analysis I/README.md	
@@ -69,4 +69,19 @@ FROM Activity
 GROUP BY 1;
 ```
 
+### **Pandas**
+
+```python
+import pandas as pd
+
+
+def game_analysis(activity: pd.DataFrame) -> pd.DataFrame:
+    return (
+        activity.groupby("player_id")
+        .agg(first_login=("event_date", "min"))
+        .reset_index()
+    )
+
+```
+
 <!-- tabs:end -->
diff --git a/solution/0500-0599/0511.Game Play Analysis I/README_EN.md b/solution/0500-0599/0511.Game Play Analysis I/README_EN.md
index 1b8d9388d0424..0780af95f1522 100644
--- a/solution/0500-0599/0511.Game Play Analysis I/README_EN.md	
+++ b/solution/0500-0599/0511.Game Play Analysis I/README_EN.md	
@@ -70,4 +70,19 @@ FROM Activity
 GROUP BY 1;
 ```
 
+### **Pandas**
+
+```python
+import pandas as pd
+
+
+def game_analysis(activity: pd.DataFrame) -> pd.DataFrame:
+    return (
+        activity.groupby("player_id")
+        .agg(first_login=("event_date", "min"))
+        .reset_index()
+    )
+
+```
+
 <!-- tabs:end -->
diff --git a/solution/0500-0599/0511.Game Play Analysis I/Solution.py b/solution/0500-0599/0511.Game Play Analysis I/Solution.py
new file mode 100644
index 0000000000000..3d42f06ede95a
--- /dev/null
+++ b/solution/0500-0599/0511.Game Play Analysis I/Solution.py	
@@ -0,0 +1,9 @@
+import pandas as pd
+
+
+def game_analysis(activity: pd.DataFrame) -> pd.DataFrame:
+    return (
+        activity.groupby("player_id")
+        .agg(first_login=("event_date", "min"))
+        .reset_index()
+    )
diff --git a/solution/0500-0599/0550.Game Play Analysis IV/README.md b/solution/0500-0599/0550.Game Play Analysis IV/README.md
index 2d748996035a1..6ff749005c789 100644
--- a/solution/0500-0599/0550.Game Play Analysis IV/README.md	
+++ b/solution/0500-0599/0550.Game Play Analysis IV/README.md	
@@ -107,4 +107,21 @@ FROM T
 WHERE rk = 1;
 ```
 
+### **pandas**
+
+```python
+import pandas as pd
+
+
+def gameplay_analysis(activity: pd.DataFrame) -> pd.DataFrame:
+    activity["first"] = activity.groupby("player_id").event_date.transform(min)
+    activity_2nd_day = activity.loc[
+        activity["first"] + pd.DateOffset(1) == activity["event_date"]
+    ]
+    return pd.DataFrame(
+        {"fraction": [round(len(activity_2nd_day) / activity.player_id.nunique(), 2)]}
+    )
+
+```
+
 <!-- tabs:end -->
diff --git a/solution/0500-0599/0550.Game Play Analysis IV/README_EN.md b/solution/0500-0599/0550.Game Play Analysis IV/README_EN.md
index d26b4e381e0be..01fc9ee34de32 100644
--- a/solution/0500-0599/0550.Game Play Analysis IV/README_EN.md	
+++ b/solution/0500-0599/0550.Game Play Analysis IV/README_EN.md	
@@ -102,4 +102,21 @@ FROM T
 WHERE rk = 1;
 ```
 
+### **pandas**
+
+```python
+import pandas as pd
+
+
+def gameplay_analysis(activity: pd.DataFrame) -> pd.DataFrame:
+    activity["first"] = activity.groupby("player_id").event_date.transform(min)
+    activity_2nd_day = activity.loc[
+        activity["first"] + pd.DateOffset(1) == activity["event_date"]
+    ]
+    return pd.DataFrame(
+        {"fraction": [round(len(activity_2nd_day) / activity.player_id.nunique(), 2)]}
+    )
+
+```
+
 <!-- tabs:end -->
diff --git a/solution/0500-0599/0550.Game Play Analysis IV/Solution.py b/solution/0500-0599/0550.Game Play Analysis IV/Solution.py
new file mode 100644
index 0000000000000..d59eb5b79eb33
--- /dev/null
+++ b/solution/0500-0599/0550.Game Play Analysis IV/Solution.py	
@@ -0,0 +1,11 @@
+import pandas as pd
+
+
+def gameplay_analysis(activity: pd.DataFrame) -> pd.DataFrame:
+    activity["first"] = activity.groupby("player_id").event_date.transform(min)
+    activity_2nd_day = activity.loc[
+        activity["first"] + pd.DateOffset(1) == activity["event_date"]
+    ]
+    return pd.DataFrame(
+        {"fraction": [round(len(activity_2nd_day) / activity.player_id.nunique(), 2)]}
+    )