diff --git a/README.md b/README.md
index e4a2dca..e229b67 100644
--- a/README.md
+++ b/README.md
@@ -36,4 +36,4 @@ Feel free to explore, learn, and share your own approaches.
 - [x] **3/28:** 28 Days Later 🧟
 - [x] **3/29:** Leaderboard Stats 📊
 - [x] **3/30:** Ye Old Emoticons 📰
-- [ ] **3/31:** My Best Streak 🔥
+- [x] **3/31:** [My Best Streak](https://github.com/codedex-io/daily-challenges/tree/main/march-2026/3-31-my-best-streak) 🔥
diff --git a/march-2026/3-31-my-best-streak/my-best-streak.py b/march-2026/3-31-my-best-streak/my-best-streak.py
new file mode 100644
index 0000000..58cdc9d
--- /dev/null
+++ b/march-2026/3-31-my-best-streak/my-best-streak.py
@@ -0,0 +1,19 @@
+def longest_streak(progress):
+  # define best and current streaks
+  best_streak = 0
+  current_streak = 0
+
+  # for each day
+  for day in progress:
+    # if completed, add 1 to current
+    if day == "✅":
+      current_streak += 1
+      # if current higher than best
+      # replace best by current
+      if current_streak > best_streak:
+        best_streak = current_streak
+    # else reset current
+    else:
+      current_streak = 0
+
+  return best_streak
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