diff --git a/workspaces/adventure-pack/goodies/python3/src/flatten/__init__.py b/workspaces/adventure-pack/goodies/python3/src/flatten/__init__.py
new file mode 100644
index 00000000..03c08731
--- /dev/null
+++ b/workspaces/adventure-pack/goodies/python3/src/flatten/__init__.py
@@ -0,0 +1,13 @@
+from typing import Generator, TypeVar
+
+T = TypeVar("T")
+
+nested_list = T | list["nested_list"]
+
+
+def flatten(self: nested_list) -> Generator[T, None, None]:
+    for i in self:
+        if isinstance(i, list):
+            yield from flatten(i)
+        else:
+            yield i
diff --git a/workspaces/adventure-pack/goodies/python3/src/flatten/goody.json b/workspaces/adventure-pack/goodies/python3/src/flatten/goody.json
new file mode 100644
index 00000000..5f25ae1f
--- /dev/null
+++ b/workspaces/adventure-pack/goodies/python3/src/flatten/goody.json
@@ -0,0 +1,3 @@
+{
+  "name": "flatten"
+}
diff --git a/workspaces/adventure-pack/goodies/python3/src/flatten/test.py b/workspaces/adventure-pack/goodies/python3/src/flatten/test.py
new file mode 100644
index 00000000..b8de3bb0
--- /dev/null
+++ b/workspaces/adventure-pack/goodies/python3/src/flatten/test.py
@@ -0,0 +1,17 @@
+from . import *
+
+
+def test_flatten():
+    input_ = [[3, 1, 4, 1], [[5, 9, [2, 6]], [5, 3, 5]], 8, 9]
+    expected = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9]
+    flattened = list(flatten(input_))
+    assert expected == flattened
+
+
+def test_flatten_random_types():
+    dictionary = {"something": "something_else"}
+    l = [["hi", -80, "c", 0.0], [[(3, 3), dictionary, 6], [5, 4, 3]], 2, 1, 0]
+    flattened = list(flatten(l))
+    assert isinstance(l[0], list)
+    expected = ["hi", -80, "c", 0.0, (3, 3), dictionary, 6, 5, 4, 3, 2, 1, 0]
+    assert flattened == expected
diff --git a/workspaces/adventure-pack/src/app/__tests__/__snapshots__/equip-test.ts.snap b/workspaces/adventure-pack/src/app/__tests__/__snapshots__/equip-test.ts.snap
index 02100edc..0ad03d9a 100644
--- a/workspaces/adventure-pack/src/app/__tests__/__snapshots__/equip-test.ts.snap
+++ b/workspaces/adventure-pack/src/app/__tests__/__snapshots__/equip-test.ts.snap
@@ -2535,6 +2535,28 @@ class UnionFind:
 ########################### END ADVENTURE PACK CODE ############################"
 `;
 
+exports[`App can equip single goody: Python 3 flatten 1`] = `
+"########################## BEGIN ADVENTURE PACK CODE ###########################
+# Adventure Pack commit fake-commit-hash
+# Running at: https://example.com/
+
+from typing import Generator, TypeVar
+
+T = TypeVar("T")
+
+nested_list = T | list["nested_list"]
+
+
+def flatten(self: nested_list) -> Generator[T, None, None]:
+    for i in self:
+        if isinstance(i, list):
+            yield from flatten(i)
+        else:
+            yield i
+
+########################### END ADVENTURE PACK CODE ############################"
+`;
+
 exports[`App can equip single goody: Python 3 int.digits 1`] = `
 "########################## BEGIN ADVENTURE PACK CODE ###########################
 # Adventure Pack commit fake-commit-hash
diff --git a/workspaces/adventure-pack/src/app/__tests__/__snapshots__/render-test.ts.snap b/workspaces/adventure-pack/src/app/__tests__/__snapshots__/render-test.ts.snap
index 88ab7c34..719a7227 100644
--- a/workspaces/adventure-pack/src/app/__tests__/__snapshots__/render-test.ts.snap
+++ b/workspaces/adventure-pack/src/app/__tests__/__snapshots__/render-test.ts.snap
@@ -1419,6 +1419,22 @@ exports[`App can render goody: Python 3 UnionFind 1`] = `
         return self.find(c1) == self.find(c2)"
 `;
 
+exports[`App can render goody: Python 3 flatten 1`] = `
+"from typing import Generator, TypeVar
+
+T = TypeVar("T")
+
+nested_list = T | list["nested_list"]
+
+
+def flatten(self: nested_list) -> Generator[T, None, None]:
+    for i in self:
+        if isinstance(i, list):
+            yield from flatten(i)
+        else:
+            yield i"
+`;
+
 exports[`App can render goody: Python 3 int.digits 1`] = `
 "from typing import Generator