diff --git a/src/debug.rs b/src/debug.rs
index 10cd923f2..421d586b9 100644
--- a/src/debug.rs
+++ b/src/debug.rs
@@ -7,11 +7,12 @@ use bones_framework::debug::frame_time_diagnostics_plugin;
 use bones_framework::networking::debug::network_debug_window;
 
 pub fn game_plugin(game: &mut Game) {
-    game.sessions.create_with(SessionNames::DEBUG, |builder| {
-        builder
-            .install_plugin(session_plugin)
-            .install_plugin(frame_time_diagnostics_plugin);
-    });
+    game.sessions
+        .create_with(SessionNames::DEBUG, |builder: &mut SessionBuilder| {
+            builder
+                .install_plugin(session_plugin)
+                .install_plugin(frame_time_diagnostics_plugin);
+        });
 }
 
 fn session_plugin(session: &mut SessionBuilder) {
diff --git a/src/main.rs b/src/main.rs
index aecf82253..3f0cdfbe3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -174,7 +174,7 @@ fn main() {
     // Create a new session for the pause menu, which sits in the background by default and only
     // does anything while the game is running.
     game.sessions
-        .create_with(SessionNames::PAUSE_MENU, |builder| {
+        .create_with(SessionNames::PAUSE_MENU, |builder: &mut SessionBuilder| {
             builder.install_plugin(ui::pause_menu::session_plugin);
         });
 
@@ -184,16 +184,19 @@ fn main() {
         .unwrap()
         .priority = 1;
 
-    // Scoring menu plugin, activated by game between round tarnsitions when appropriate
-    game.sessions.create_with(SessionNames::SCORING, |builder| {
-        builder.install_plugin(ui::scoring::session_plugin);
-    });
+    // Scoring menu plugin, activated by game between round transitions when appropriate
+    game.sessions
+        .create_with(SessionNames::SCORING, |builder: &mut SessionBuilder| {
+            builder.install_plugin(ui::scoring::session_plugin);
+        });
 
     // session for pop-ups / nofication UI
-    game.sessions
-        .create_with(SessionNames::NOTIFICATION, |builder| {
+    game.sessions.create_with(
+        SessionNames::NOTIFICATION,
+        |builder: &mut SessionBuilder| {
             builder.install_plugin(ui::notification::session_plugin);
-        });
+        },
+    );
 
     // Create a bevy renderer for the bones game and run it.
     BonesBevyRenderer {
diff --git a/src/profiler.rs b/src/profiler.rs
index fde22b692..1bfe68f42 100644
--- a/src/profiler.rs
+++ b/src/profiler.rs
@@ -6,7 +6,7 @@ use crate::prelude::*;
 pub fn game_plugin(game: &mut Game) {
     game.systems.add_before_system(mark_new_frame);
     game.sessions
-        .create_with(SessionNames::PROFILER, |builder| {
+        .create_with(SessionNames::PROFILER, |builder: &mut SessionBuilder| {
             builder.install_plugin(session_plugin);
         });
 }
diff --git a/src/sessions.rs b/src/sessions.rs
index 4d99eb9d0..2bdc66975 100644
--- a/src/sessions.rs
+++ b/src/sessions.rs
@@ -23,7 +23,7 @@ pub trait SessionExt {
 
 impl SessionExt for Sessions {
     fn start_menu(&mut self) {
-        self.create_with(SessionNames::MAIN_MENU, |builder| {
+        self.create_with(SessionNames::MAIN_MENU, |builder: &mut SessionBuilder| {
             builder.install_plugin(crate::ui::main_menu::session_plugin);
         });
     }
@@ -74,7 +74,7 @@ impl SessionExt for Sessions {
                 score
             };
 
-            self.create_with(SessionNames::GAME, |builder| {
+            self.create_with(SessionNames::GAME, |builder: &mut SessionBuilder| {
                 builder.install_plugin(crate::core::MatchPlugin {
                     maps: map_pool,
                     player_info,
@@ -89,7 +89,7 @@ impl SessionExt for Sessions {
     }
 
     fn start_game(&mut self, match_plugin: crate::core::MatchPlugin) {
-        self.create_with(SessionNames::GAME, |builder| {
+        self.create_with(SessionNames::GAME, |builder: &mut SessionBuilder| {
             builder.install_plugin(match_plugin);
         });
     }
diff --git a/src/ui/pause_menu.rs b/src/ui/pause_menu.rs
index ed9874665..c52db4ae0 100644
--- a/src/ui/pause_menu.rs
+++ b/src/ui/pause_menu.rs
@@ -137,7 +137,7 @@ fn pause_menu_system(
             .deref()
             .clone();
         sessions.end_game();
-        sessions.create_with(SessionNames::GAME, |builder| {
+        sessions.create_with(SessionNames::GAME, |builder: &mut SessionBuilder| {
             builder.install_plugin(crate::core::MatchPlugin {
                 maps,
                 player_info: std::array::from_fn(|i| PlayerInput {