diff --git a/server/host.py b/server/host.py
index 97d1251..2da1ba8 100644
--- a/server/host.py
+++ b/server/host.py
@@ -62,7 +62,7 @@ async def get_puzzle(id: str):
     tf = data / f"{id}.json"
     if not tf.exists():
         return {"error": "Puzzle not found"}
-    return tf.read_text()
+    return json.loads(tf.read_text())
 
 
 # Getting / redirects to main page
diff --git a/src/App.svelte b/src/App.svelte
index 1572051..0989dc0 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -9,10 +9,9 @@
   const params = new URLSearchParams(location.search)
 
   // Can pass in puzzle data from props
-  interface Props { puzzleData?: { id: string, rows: number, cols: number, 
-    numbers: i8s, nMask: i8s, hColors: i8s, vColors: i8s, colors: string[] } }
-  export let { puzzleData }: Props = {}
-  const pid = puzzleData?.id ?? 'slitherlink'
+  interface Props { puzzleId?: string, puzzleData?: Checkpoint }
+  export let { puzzleId, puzzleData }: Props = {}
+  const pid = puzzleId ?? 'slitherlink'
 
   // Main variables
   const [rows, cols] = [+(puzzleData?.rows ?? params.get('size') ?? 40), +(puzzleData?.cols ?? params.get('size') ?? 40)]
diff --git a/src/utils.ts b/src/utils.ts
index 2420fe4..86043fb 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,11 +1,13 @@
 
 export type i8s = Int8Array
-export interface Checkpoint { hStates: i8s, vStates: i8s, hColors: i8s, vColors: i8s, numbers: i8s, nMask: i8s, colors: string[] }
+export interface Checkpoint { rows: number, cols: number,
+  hStates: i8s, vStates: i8s, hColors: i8s, vColors: i8s, numbers: i8s, nMask: i8s, colors: string[] }
 
 export const cfg = {
   cellW: 20,
   lineW: 4,
-  totalW: 24
+  totalW: 24,
+  backend: "https://slither0.hydev.org",
 }
 
 export const eStates = {
@@ -67,3 +69,8 @@ export const Fmt = {
     return `${d ? `${d}d ` : ''}${h ? `${h}:` : ''}${m.toString().padStart(2, '0')}:${s.toString().padStart(2, '0')}`
   }
 }
+
+export const Backend = {
+  get: (id: string) => fetch(`${cfg.backend}/${id}`).then(r => r.text()).then(JsonTy.parse),
+  post: (data: Checkpoint) => fetch(`${cfg.backend}/`, { method: "post", body: JsonTy.stringify(data) }),
+}