diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d064ac07..74d622bea 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -510,6 +510,7 @@ src/gui/sampleEdit.cpp
 src/gui/settings.cpp
 src/gui/songInfo.cpp
 src/gui/songNotes.cpp
+src/gui/spoiler.cpp
 src/gui/stats.cpp
 src/gui/subSongs.cpp
 src/gui/sysConf.cpp
diff --git a/src/gui/debugWindow.cpp b/src/gui/debugWindow.cpp
index 7d6d057f1..22527a7b8 100644
--- a/src/gui/debugWindow.cpp
+++ b/src/gui/debugWindow.cpp
@@ -369,6 +369,9 @@ void FurnaceGUI::drawDebug() {
       if (ImGui::Button("Inspect")) {
         inspectorOpen=!inspectorOpen;
       }
+      if (ImGui::Button("Spoiler")) {
+        spoilerOpen=!spoilerOpen;
+      }
       ImGui::TreePop();
     }
     if (ImGui::TreeNode("Performance")) {
diff --git a/src/gui/findReplace.cpp b/src/gui/findReplace.cpp
index f16ccd7ae..78abce7cb 100644
--- a/src/gui/findReplace.cpp
+++ b/src/gui/findReplace.cpp
@@ -1,3 +1,22 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
 #include "gui.h"
 #include "imgui.h"
 #include "IconsFontAwesome4.h"
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index dc45acf49..9b37f987c 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -3006,6 +3006,7 @@ bool FurnaceGUI::loop() {
         if (ImGui::MenuItem("register view",BIND_FOR(GUI_ACTION_WINDOW_REGISTER_VIEW),regViewOpen)) regViewOpen=!regViewOpen;
         if (ImGui::MenuItem("log viewer",BIND_FOR(GUI_ACTION_WINDOW_LOG),logOpen)) logOpen=!logOpen;
         if (ImGui::MenuItem("statistics",BIND_FOR(GUI_ACTION_WINDOW_STATS),statsOpen)) statsOpen=!statsOpen;
+        if (spoilerOpen) if (ImGui::MenuItem("spoiler",NULL,spoilerOpen)) spoilerOpen=!spoilerOpen;
       
         ImGui::EndMenu();
       }
@@ -4035,6 +4036,7 @@ bool FurnaceGUI::init() {
   effectListOpen=e->getConfBool("effectListOpen",false);
   subSongsOpen=e->getConfBool("subSongsOpen",true);
   findOpen=e->getConfBool("findOpen",false);
+  spoilerOpen=e->getConfBool("spoilerOpen",false);
 
   tempoView=e->getConfBool("tempoView",true);
   waveHex=e->getConfBool("waveHex",false);
@@ -4258,6 +4260,7 @@ bool FurnaceGUI::finish() {
   e->setConf("effectListOpen",effectListOpen);
   e->setConf("subSongsOpen",subSongsOpen);
   e->setConf("findOpen",findOpen);
+  e->setConf("spoilerOpen",spoilerOpen);
 
   // commit last window size
   e->setConf("lastWindowWidth",scrW);
@@ -4407,6 +4410,7 @@ FurnaceGUI::FurnaceGUI():
   chanOscOpen(false),
   subSongsOpen(true),
   findOpen(false),
+  spoilerOpen(false),
   selecting(false),
   selectingFull(false),
   dragging(false),
diff --git a/src/gui/gui.h b/src/gui/gui.h
index ac15d5a8a..271b8eaa4 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -246,7 +246,8 @@ enum FurnaceGUIWindows {
   GUI_WINDOW_EFFECT_LIST,
   GUI_WINDOW_CHAN_OSC,
   GUI_WINDOW_SUBSONGS,
-  GUI_WINDOW_FIND
+  GUI_WINDOW_FIND,
+  GUI_WINDOW_SPOILER
 };
 
 enum FurnaceGUIFileDialogs {
@@ -1149,7 +1150,7 @@ class FurnaceGUI {
   bool waveListOpen, waveEditOpen, sampleListOpen, sampleEditOpen, aboutOpen, settingsOpen;
   bool mixerOpen, debugOpen, inspectorOpen, oscOpen, volMeterOpen, statsOpen, compatFlagsOpen;
   bool pianoOpen, notesOpen, channelsOpen, regViewOpen, logOpen, effectListOpen, chanOscOpen;
-  bool subSongsOpen, findOpen;
+  bool subSongsOpen, findOpen, spoilerOpen;
 
   SelectionPoint selStart, selEnd, cursor, cursorDrag, dragStart, dragEnd;
   bool selecting, selectingFull, dragging, curNibble, orderNibble, followOrders, followPattern, changeAllOrders, mobileUI;
@@ -1445,6 +1446,7 @@ class FurnaceGUI {
   void drawEffectList();
   void drawSubSongs();
   void drawFindReplace();
+  void drawSpoiler();
 
   void parseKeybinds();
   void promptKey(int which);
diff --git a/src/gui/spoiler.cpp b/src/gui/spoiler.cpp
new file mode 100644
index 000000000..dc64b14ce
--- /dev/null
+++ b/src/gui/spoiler.cpp
@@ -0,0 +1,37 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "gui.h"
+#include "imgui.h"
+
+void FurnaceGUI::drawSpoiler() {
+  if (nextWindow==GUI_WINDOW_SPOILER) {
+    spoilerOpen=true;
+    ImGui::SetNextWindowFocus();
+    nextWindow=GUI_WINDOW_NOTHING;
+  }
+  if (!spoilerOpen) return;
+  if (ImGui::Begin("Spoiler",&spoilerOpen,globalWinFlags|ImGuiWindowFlags_NoTitleBar|ImGuiWindowFlags_AlwaysAutoResize)) {
+    ImGui::PushFont(bigFont);
+    ImGui::Text("SPOILER");
+    ImGui::PopFont();
+  }
+  if (ImGui::IsWindowFocused(ImGuiFocusedFlags_ChildWindows)) curWindow=GUI_WINDOW_SPOILER;
+  ImGui::End();
+}