diff --git a/game/src/challenges.rs b/game/src/challenges.rs
new file mode 100644
index 0000000000..a1fc4bdf2d
--- /dev/null
+++ b/game/src/challenges.rs
@@ -0,0 +1,91 @@
+use crate::game::{State, Transition, WizardState};
+use crate::ui::UI;
+use ezgui::{
+    hotkey, Choice, EventCtx, GfxCtx, HorizontalAlignment, Key, Line, ModalMenu, Text,
+    VerticalAlignment,
+};
+
+// TODO Also have some kind of screenshot to display for each challenge
+#[derive(Clone)]
+struct Challenge {
+    title: String,
+    description: String,
+    map_name: String,
+    scenario_name: String,
+}
+impl abstutil::Cloneable for Challenge {}
+
+fn all_challenges() -> Vec<Challenge> {
+    vec![
+        Challenge {
+            title: "Speed up route 980".to_string(),
+            description:
+                "Decrease the average waiting time between all of 980's stops by at least 30s"
+                    .to_string(),
+            map_name: "montlake".to_string(),
+            scenario_name: "weekday_typical_traffic_from_psrc".to_string(),
+        },
+        Challenge {
+            title: "Speed up route 27 along Yesler".to_string(),
+            description:
+                "Decrease the average waiting time between all of 27's stops by at least 30s"
+                    .to_string(),
+            map_name: "23rd".to_string(),
+            scenario_name: "weekday_typical_traffic_from_psrc".to_string(),
+        },
+    ]
+}
+
+pub fn challenges_picker() -> Box<dyn State> {
+    WizardState::new(Box::new(move |wiz, ctx, _| {
+        let (_, challenge) = wiz.wrap(ctx).choose("Play which challenge?", || {
+            all_challenges()
+                .into_iter()
+                .map(|c| Choice::new(c.title.clone(), c))
+                .collect()
+        })?;
+
+        let mut summary = Text::from(Line(&challenge.description));
+        summary.add(Line(""));
+        summary.add(Line("Proposals:"));
+        summary.add(Line(""));
+        summary.add(Line("- bus lane fix (untested)"));
+        summary.add(Line("- signal retiming (score 500)"));
+
+        Some(Transition::Replace(Box::new(ChallengeSplash {
+            summary,
+            menu: ModalMenu::new(
+                &challenge.title,
+                vec![
+                    (hotkey(Key::Escape), "back to challenges"),
+                    (hotkey(Key::S), "start challenge"),
+                    (hotkey(Key::L), "load existing proposal"),
+                ],
+                ctx,
+            ),
+        })))
+    }))
+}
+
+struct ChallengeSplash {
+    menu: ModalMenu,
+    summary: Text,
+}
+
+impl State for ChallengeSplash {
+    fn event(&mut self, ctx: &mut EventCtx, _: &mut UI) -> Transition {
+        self.menu.event(ctx);
+        if self.menu.action("back to challenges") {
+            return Transition::Replace(challenges_picker());
+        }
+        Transition::Keep
+    }
+
+    fn draw(&self, g: &mut GfxCtx, _: &UI) {
+        g.draw_blocking_text(
+            &self.summary,
+            (HorizontalAlignment::Center, VerticalAlignment::Center),
+        );
+        self.menu.draw(g);
+    }
+}
diff --git a/game/src/main.rs b/game/src/main.rs
index 363f9ddf65..fbab5e0b82 100644
--- a/game/src/main.rs
+++ b/game/src/main.rs
@@ -1,4 +1,5 @@
 mod abtest;
+mod challenges;
 mod common;
 mod debug;
 mod edit;
diff --git a/game/src/splash_screen.rs b/game/src/splash_screen.rs
index 6500597b11..c998fc14df 100644
--- a/game/src/splash_screen.rs
+++ b/game/src/splash_screen.rs
@@ -1,4 +1,5 @@
 use crate::abtest::setup::PickABTest;
+use crate::challenges::challenges_picker;
 use crate::debug::DebugMode;
 use crate::edit::EditMode;
 use crate::game::{State, Transition};
@@ -123,6 +124,7 @@ fn splash_screen(
 ) -> Option<Transition> {
     let mut wizard = raw_wizard.wrap(ctx);
     let sandbox = "Sandbox mode";
+    let challenge = "Challenge mode";
     let load_map = "Load another map";
     let edit = "Edit map";
     let abtest = "A/B Test Mode";
@@ -142,6 +144,7 @@ fn splash_screen(
         .choose("Welcome to A/B Street!", || {
             vec![
                 Choice::new(sandbox, ()).key(Key::S),
+                Choice::new(challenge, ()).key(Key::C),
                 Choice::new(load_map, ()).key(Key::L),
                 Choice::new(edit, ()).key(Key::E),
                 Choice::new(abtest, ()).key(Key::A),
@@ -156,6 +159,7 @@ fn splash_screen(
         .as_str()
     {
         x if x == sandbox => Some(Transition::Push(Box::new(SandboxMode::new(ctx, ui)))),
+        x if x == challenge => Some(Transition::Push(challenges_picker())),
         x if x == load_map => {
             if let Some(name) = wizard.choose_string("Load which map?", || {
                 let current_map = ui.primary.map.get_name();