diff --git a/CustomDump.playground/Contents.swift b/CustomDump.playground/Contents.swift
deleted file mode 100644
index 8379491..0000000
--- a/CustomDump.playground/Contents.swift
+++ /dev/null
@@ -1,46 +0,0 @@
-import CustomDump
-import Foundation
-
-struct User {
-  var favoriteNumbers: [Int]
-  var id: Int
-  var name: String
-}
-
-var user = User(
-  favoriteNumbers: [42, 1729],
-  id: 2,
-  name: "Blob"
-)
-
-var users = (1...5).map {
-  User(
-    favoriteNumbers: [$0],
-    id: $0,
-    name: "Blob \($0)"
-  )
-}
-
-var other = users
-other.append(
-  .init(
-    favoriteNumbers: [42, 1729],
-    id: 100,
-    name: "Blob Sr."
-  )
-)
-
-print(diff(users, other)!)
-
-struct MyError: Error {
-  var id = 1
-  var message = "asdf"
-}
-
-let error: Error = NSError(
-  domain: "co.pointfree",
-  code: 42,
-  userInfo: [NSLocalizedDescriptionKey: "Something went wrong"]
-)
-customDump(error)
-dump(error)
diff --git a/CustomDump.playground/contents.xcplayground b/CustomDump.playground/contents.xcplayground
deleted file mode 100644
index 1c968e7..0000000
--- a/CustomDump.playground/contents.xcplayground
+++ /dev/null
@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<playground version='5.0' target-platform='macos' buildActiveScheme='true' importAppTypes='true'>
-    <timeline fileName='timeline.xctimeline'/>
-</playground>
\ No newline at end of file
diff --git a/CustomDump.playground/playground.xcworkspace/contents.xcworkspacedata b/CustomDump.playground/playground.xcworkspace/contents.xcworkspacedata
deleted file mode 100644
index 919434a..0000000
--- a/CustomDump.playground/playground.xcworkspace/contents.xcworkspacedata
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Workspace
-   version = "1.0">
-   <FileRef
-      location = "self:">
-   </FileRef>
-</Workspace>