diff --git a/src/config.rs b/src/config.rs
index f7a6953cd5..c4f4b1ba6a 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -21,6 +21,13 @@ pub struct EngineConfig {
     #[arg(short = 'R', long)]
     pub hot_reload: bool,
 
+    /// Sets the sync test distance during local play.
+    ///
+    /// This is useful for developers for testing game rollback determinism without having to start
+    /// a network game.
+    #[arg(short = 'C', long, default_value = "0")]
+    pub sync_test_check_distance: usize,
+
     /// The directory to load assets from
     #[arg(short, long, env = ASSET_DIR_ENV_VAR)]
     pub asset_dir: Option<String>,
diff --git a/src/session.rs b/src/session.rs
index e3016ada88..8907020f13 100644
--- a/src/session.rs
+++ b/src/session.rs
@@ -11,6 +11,7 @@ use bevy_ggrs::{
 use jumpy_matchmaker_proto::TargetClient;
 
 use crate::{
+    config::ENGINE_CONFIG,
     networking::{client::NetClient, proto::ClientMatchInfo},
     player,
     prelude::*,
@@ -103,9 +104,7 @@ impl<'w, 's> SessionManager<'w, 's> {
             builder = builder
                 .with_input_delay(INPUT_DELAY)
                 .with_num_players(player::MAX_PLAYERS)
-                // TODO: Add some flag to enable the non-zero check distance, instead of wasting
-                // processing power for local games.
-                .with_check_distance(7);
+                .with_check_distance(ENGINE_CONFIG.sync_test_check_distance);
 
             for i in 0..player::MAX_PLAYERS {
                 builder = builder.add_player(ggrs::PlayerType::Local, i).unwrap();
diff --git a/src/ui/editor.rs b/src/ui/editor.rs
index 6efb20c192..82cdfe7e88 100644
--- a/src/ui/editor.rs
+++ b/src/ui/editor.rs
@@ -13,6 +13,7 @@ use crate::{
     metadata::{GameMeta, MapLayerKind, MapLayerMeta, MapMeta},
     player::input::PlayerInputs,
     prelude::*,
+    session::SessionManager,
     utils::ResetManager,
 };
 
@@ -154,6 +155,7 @@ struct EditorTopBar<'w, 's> {
     map_meta: Query<'w, 's, &'static MapMeta>,
     map_handle: Query<'w, 's, &'static AssetHandle<MapMeta>>,
     settings: ResMut<'w, EditorState>,
+    session_manager: SessionManager<'w, 's>,
 }
 
 impl<'w, 's> WidgetSystem for EditorTopBar<'w, 's> {
@@ -248,6 +250,7 @@ impl<'w, 's> WidgetSystem for EditorTopBar<'w, 's> {
                                 .spawn()
                                 .insert(handle)
                                 .insert(Rollback::new(params.rids.next_id()));
+                            params.session_manager.start_session();
                         }
                     }
                 });
@@ -668,6 +671,7 @@ struct EditorCentralPanel<'w, 's> {
         With<EditorCamera>,
     >,
     localization: Res<'w, Localization>,
+    session_manager: SessionManager<'w, 's>,
 }
 
 struct MapCreateInfo {
@@ -827,6 +831,7 @@ fn map_open_dialog(ui: &mut egui::Ui, params: &mut EditorCentralPanel) {
                     ) {
                         if ui.button(&map_name).clicked() {
                             params.commands.spawn().insert(map_handle);
+                            params.session_manager.start_session();
                             *params.show_map_open = false;
                         }
                     }