diff --git a/rogueviz/ads/ads-game.cpp b/rogueviz/ads/ads-game.cpp
index 890b2bf9..f8b5f4d8 100644
--- a/rogueviz/ads/ads-game.cpp
+++ b/rogueviz/ads/ads-game.cpp
@@ -1,6 +1,7 @@
 /* Main file of Relative Hell. */
 /* Compile with mymake -O3 -rv rogueviz/ads/ads-game */
 /* Best run with -ads-menu; more detailed options are available too */
+/* You can also add -DRELHELL for standalone Relative Hell */
 
 #define VER_RH "1.1"
 
diff --git a/rogueviz/ads/ads-lands.cpp b/rogueviz/ads/ads-lands.cpp
index 80073b5c..06d20ce5 100644
--- a/rogueviz/ads/ads-lands.cpp
+++ b/rogueviz/ads/ads-lands.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: specification of the lands in the anti-de Sitter game
+// Copyright (C) 2024-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/control.cpp b/rogueviz/ads/control.cpp
index 6495d071..ec932342 100644
--- a/rogueviz/ads/control.cpp
+++ b/rogueviz/ads/control.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: control for the anti-de Sitter game
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/display.cpp b/rogueviz/ads/display.cpp
index ec0c7c94..391da5ba 100644
--- a/rogueviz/ads/display.cpp
+++ b/rogueviz/ads/display.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: display for the AdS game
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/ds-game.cpp b/rogueviz/ads/ds-game.cpp
index 52c0fcf6..a0f95495 100644
--- a/rogueviz/ads/ds-game.cpp
+++ b/rogueviz/ads/ds-game.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: implemetation of the de Sitter game
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/ds-texture.cpp b/rogueviz/ads/ds-texture.cpp
index bc5ad547..81c29888 100644
--- a/rogueviz/ads/ds-texture.cpp
+++ b/rogueviz/ads/ds-texture.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: implementation of the Earth texture for the de Sitter game
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/globals.cpp b/rogueviz/ads/globals.cpp
index b813694e..be09cc8d 100644
--- a/rogueviz/ads/globals.cpp
+++ b/rogueviz/ads/globals.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: globals
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/help.cpp b/rogueviz/ads/help.cpp
index 5135c37d..51533f24 100644
--- a/rogueviz/ads/help.cpp
+++ b/rogueviz/ads/help.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: help
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 namespace ads_game {
 
diff --git a/rogueviz/ads/hiscore.cpp b/rogueviz/ads/hiscore.cpp
index b4f25395..22155bd4 100644
--- a/rogueviz/ads/hiscore.cpp
+++ b/rogueviz/ads/hiscore.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: high score lists
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/map.cpp b/rogueviz/ads/map.cpp
index ddc99cb2..8e87bd38 100644
--- a/rogueviz/ads/map.cpp
+++ b/rogueviz/ads/map.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: map for the anti-de Sitter game
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/math.cpp b/rogueviz/ads/math.cpp
index ba601654..bae8fad7 100644
--- a/rogueviz/ads/math.cpp
+++ b/rogueviz/ads/math.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: implemetation of the underlying math
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 #include "../rogueviz.h"
 
 namespace hr {
diff --git a/rogueviz/ads/menu.cpp b/rogueviz/ads/menu.cpp
index 7449d104..8b111f4a 100644
--- a/rogueviz/ads/menu.cpp
+++ b/rogueviz/ads/menu.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: menus
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/resources.cpp b/rogueviz/ads/resources.cpp
index 2d52a324..64ea947e 100644
--- a/rogueviz/ads/resources.cpp
+++ b/rogueviz/ads/resources.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: resources
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/shapes.cpp b/rogueviz/ads/shapes.cpp
index b070f644..75d0b158 100644
--- a/rogueviz/ads/shapes.cpp
+++ b/rogueviz/ads/shapes.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: shapes of various stuff
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/tour.cpp b/rogueviz/ads/tour.cpp
index 08c4559d..82dcb640 100644
--- a/rogueviz/ads/tour.cpp
+++ b/rogueviz/ads/tour.cpp
@@ -1,3 +1,6 @@
+// Relative Hell: guided tour
+// Copyright (C) 2025-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 
 namespace ads_game {
diff --git a/rogueviz/ads/views.cpp b/rogueviz/ads/views.cpp
index 4c72a41e..530f19b0 100644
--- a/rogueviz/ads/views.cpp
+++ b/rogueviz/ads/views.cpp
@@ -1,4 +1,5 @@
-/* underlying/spacetime views, and also replaying */
+// Relative Hell: underlying/spacetime views, and also replaying
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
 
 namespace hr {
 
diff --git a/rogueviz/bringris.cpp b/rogueviz/bringris.cpp
index c27486b2..fefc8000 100644
--- a/rogueviz/bringris.cpp
+++ b/rogueviz/bringris.cpp
@@ -1,5 +1,8 @@
 // non-Euclidean falling block game, implemented using the HyperRogue engine
-// Copyright (C) 2011-2021 Zeno Rogue, see 'hyper.cpp' for details
+// Copyright (C) 2011-2021 Zeno Rogue, see '../hyper.cpp' for details
+
+// compile with: ./mymake -O3 rogueviz/bringris.cpp rogueviz/subquotient.cpp and then launch with -bringris
+// add -DBRINGRIS for standalone Bringris
 
 #define BRINGRIS_VER "2.0"
 
diff --git a/rogueviz/nilrider/level.cpp b/rogueviz/nilrider/level.cpp
index a8b81e57..f0611270 100644
--- a/rogueviz/nilrider/level.cpp
+++ b/rogueviz/nilrider/level.cpp
@@ -1,3 +1,6 @@
+// Nil Rider level data
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace nilrider {
 
 const int steps_per_block = 16;
diff --git a/rogueviz/nilrider/levels.cpp b/rogueviz/nilrider/levels.cpp
index 735ba4fd..ca690b92 100644
--- a/rogueviz/nilrider/levels.cpp
+++ b/rogueviz/nilrider/levels.cpp
@@ -1,3 +1,6 @@
+// Nil Rider levels
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace nilrider {
 
 bool all(checkerparam c) { return c.t->collected_triangles == Flag(isize(c.l->triangles))-1; }
diff --git a/rogueviz/nilrider/nilrider.cpp b/rogueviz/nilrider/nilrider.cpp
index 3ccfa8aa..ce074d31 100644
--- a/rogueviz/nilrider/nilrider.cpp
+++ b/rogueviz/nilrider/nilrider.cpp
@@ -1,3 +1,9 @@
+// Nil Rider
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
+// compile with: ./mymake -O3 rogueviz/nilrider/nilrider.cpp and then launch with -nilrider
+// add -DNILRIDER for standalone Nil Rider
+
 #if NILRIDER
 #define CUSTOM_CAPTION "Nil Rider 2.0"
 #define MAXMDIM 4
diff --git a/rogueviz/nilrider/planning.cpp b/rogueviz/nilrider/planning.cpp
index 59596707..e5426f6f 100644
--- a/rogueviz/nilrider/planning.cpp
+++ b/rogueviz/nilrider/planning.cpp
@@ -1,3 +1,6 @@
+// Nil Rider: planning mode
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace nilrider {
 
 hyperpoint get_spline(ld t);
diff --git a/rogueviz/nilrider/save.cpp b/rogueviz/nilrider/save.cpp
index 46bc6dd7..ed9ccc1e 100644
--- a/rogueviz/nilrider/save.cpp
+++ b/rogueviz/nilrider/save.cpp
@@ -1,3 +1,6 @@
+// Nil Rider: saves
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace nilrider {
 
 const string ver = "2.0";
diff --git a/rogueviz/nilrider/solver.cpp b/rogueviz/nilrider/solver.cpp
index 4b75c862..5dd46801 100644
--- a/rogueviz/nilrider/solver.cpp
+++ b/rogueviz/nilrider/solver.cpp
@@ -1,3 +1,6 @@
+// Nil Rider Solver
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace nilrider {
 
 bool nospeed = false;
diff --git a/rogueviz/nilrider/statues.cpp b/rogueviz/nilrider/statues.cpp
index ed706452..d05ddb87 100644
--- a/rogueviz/nilrider/statues.cpp
+++ b/rogueviz/nilrider/statues.cpp
@@ -1,3 +1,6 @@
+// Nil Rider statues
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace hr {
 namespace bricks {
 
diff --git a/rogueviz/nilrider/timestamp.cpp b/rogueviz/nilrider/timestamp.cpp
index 1638df1d..1b1f3851 100644
--- a/rogueviz/nilrider/timestamp.cpp
+++ b/rogueviz/nilrider/timestamp.cpp
@@ -1,3 +1,6 @@
+// Nil Rider simulation
+// Copyright (C) 2022-2025 Zeno Rogue, see '../../hyper.cpp' for details
+
 namespace nilrider {
 
 using hr::lerp;
diff --git a/rogueviz/seuphorica.cpp b/rogueviz/seuphorica.cpp
index 8b59e130..18f91787 100644
--- a/rogueviz/seuphorica.cpp
+++ b/rogueviz/seuphorica.cpp
@@ -2,6 +2,8 @@
 // Copyright (C) 2025 Zeno Rogue, see 'hyper.cpp' for details
 // the Seuphorica repo (seuphorica.cpp and dictionary files) needs to be placed in the 'seuphorica' subdirectory
 
+// compile with: ./mymake -O3 rogueviz/seuphorica.cpp and then launch with -seuphorica
+
 #include "rogueviz.h"
 #include <fstream>