diff --git a/src/Launcher.svelte b/src/Launcher.svelte
index fd709fd..a295256 100644
--- a/src/Launcher.svelte
+++ b/src/Launcher.svelte
@@ -9,7 +9,7 @@
   let error: string | null = null;
 
   if (!puzzleId) window.location.href = "/?puzzle=meow";
-  else Backend.get(puzzleId).then((data) => (puzzleData = data)).catch((e) => (error = e));
+  else Backend.get(puzzleId).then((data) => (puzzleData = data)).catch(e => (error = e));
 </script>
 
 {#if puzzleData !== null && puzzleId !== null}
diff --git a/src/utils.ts b/src/utils.ts
index 86043fb..15cee76 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -71,6 +71,9 @@ export const Fmt = {
 }
 
 export const Backend = {
-  get: (id: string) => fetch(`${cfg.backend}/${id}`).then(r => r.text()).then(JsonTy.parse),
+  get: (id: string) => fetch(`${cfg.backend}/${id}`).then(r => {
+    if (!r.ok) throw new Error(`Failed to get puzzle: ${r.status}`)
+    r.text()
+  }).then(JsonTy.parse),
   post: (data: Checkpoint) => fetch(`${cfg.backend}/`, { method: "post", body: JsonTy.stringify(data) }),
 }