diff --git a/v2/entities.py b/v2/entities.py
index f23babe..b12e9b9 100644
--- a/v2/entities.py
+++ b/v2/entities.py
@@ -1,6 +1,7 @@
 class MemoryContext:
-  playfieldSize = 0
   playfieldItems = {}
+  playfieldSize = 0
+  selectedItems = []
 
 def memory_createEmptyContext():
   return MemoryContext()
diff --git a/v2/functions.py b/v2/functions.py
index d46aa4d..18b398d 100644
--- a/v2/functions.py
+++ b/v2/functions.py
@@ -1,8 +1,5 @@
 from entities import *
 
-
-# L4: Function.
-
 def memory_generateConstPlayfield(
   c: MemoryContext
 ) -> str:
@@ -15,10 +12,18 @@ def memory_generateConstPlayfield(
     id += 1
   #}
   c.playfieldItems = idGroups
-  return "MemoryContext.playfieldItems"
+  return "playfieldItems"
 #}
 
-# L20: Test.
+def memory_selectItem(
+  c: MemoryContext,
+  id: int
+) -> str:
+  c.selectedItems.append(id)
+  return "selectedItems"
+#}
+
+# Test.
 
 def test_memory_generateConstPlayfield(
 ) -> str:
@@ -26,7 +31,7 @@ def test_memory_generateConstPlayfield(
   c.playfieldSize = 2
   fieldName = memory_generateConstPlayfield(c)
   if (
-    fieldName == "MemoryContext.playfieldItems" and
+    fieldName == "playfieldItems" and
     len(c.playfieldItems) == 4 and
     c.playfieldItems[0] == 0 and
     c.playfieldItems[1] == 0 and
@@ -37,3 +42,22 @@ def test_memory_generateConstPlayfield(
   #}
   return "ERR: memory_generateConstPlayfield"
 #}
+
+def test_memory_selectItem(
+) -> str:
+  c = memory_createEmptyContext()
+  c.playfieldSize = 2
+  memory_generateConstPlayfield(c)
+  # Select the item with group 0.
+  fieldName = memory_selectItem(c, 0)
+
+  # See if it's in selectedItems now.
+  if (
+    fieldName == "selectedItems" and
+    len(c.selectedItems) == 1 and
+    c.selectedItems[0] == 0
+  ):
+    return "OK: memory_selectItem"
+  #}
+  return "ERR: memory_selectItem"
+#}
diff --git a/v2/gen-Python b/v2/gen-Python
new file mode 100755
index 0000000..44f45f4
--- /dev/null
+++ b/v2/gen-Python
@@ -0,0 +1,2 @@
+echo "python3 main.py" > test_memory_Python
+chmod +x test_memory_Python
diff --git a/v2/main.py b/v2/main.py
index 01ff942..bd9a29c 100644
--- a/v2/main.py
+++ b/v2/main.py
@@ -2,3 +2,4 @@ from entities import *
 from functions import *
 
 print(test_memory_generateConstPlayfield())
+print(test_memory_selectItem())