diff --git a/hosts/physical/crow/host-configs/niri/config.kdl b/hosts/physical/crow/host-configs/niri/config.kdl
index 4bcb1fe..23305f6 100644
--- a/hosts/physical/crow/host-configs/niri/config.kdl
+++ b/hosts/physical/crow/host-configs/niri/config.kdl
@@ -98,6 +98,11 @@ window-rule {
     open-floating true
 }
 
+window-rule {
+    match app-id=r#"^steam_app_default$"# title=r#"^PlayOnline Viewer.+$"#
+    open-floating true
+}
+
 // Example: block out two password managers from screen capture.
 window-rule {
     match app-id=r#"^org\.keepassxc\.KeePassXC$"#
diff --git a/nixos/roles/physical/desktop/common/apps/default.nix b/nixos/roles/physical/desktop/common/apps/default.nix
index 532a81a..ded5411 100644
--- a/nixos/roles/physical/desktop/common/apps/default.nix
+++ b/nixos/roles/physical/desktop/common/apps/default.nix
@@ -8,5 +8,6 @@
     ./usbutils.nix
     ./bolt-launcher.nix
     ./lutris.nix
+    ./gamescope.nix
   ];
 }
diff --git a/nixos/roles/physical/desktop/common/apps/gamescope.nix b/nixos/roles/physical/desktop/common/apps/gamescope.nix
new file mode 100644
index 0000000..9bae182
--- /dev/null
+++ b/nixos/roles/physical/desktop/common/apps/gamescope.nix
@@ -0,0 +1,5 @@
+{ pkgs, ... }:
+
+{
+  programs.gamescope.enable = true;
+}