diff --git a/client/src/components/GameMenu.tsx b/client/src/components/GameMenu.tsx
index 970049a..ab0d41b 100644
--- a/client/src/components/GameMenu.tsx
+++ b/client/src/components/GameMenu.tsx
@@ -3,14 +3,31 @@ import { Button } from './Button'
 import { GameIdContext } from '../App';
 import { useStore } from 'react-redux';
 import { useAppDispatch, useAppSelector } from '../hooks';
+import { useSelector } from 'react-redux';
 
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
 import { faDownload, faUpload, faEraser } from '@fortawesome/free-solid-svg-icons'
 
-import { deleteProgress } from '../state/progress';
+import { deleteProgress, selectProgress, loadProgress, GameProgressState } from '../state/progress';
+
+const downloadFile = ({ data, fileName, fileType }) => {
+  const blob = new Blob([data], { type: fileType })
+  const a = document.createElement('a')
+  a.download = fileName
+  a.href = window.URL.createObjectURL(blob)
+  const clickEvt = new MouseEvent('click', {
+    view: window,
+    bubbles: true,
+    cancelable: true,
+  })
+  a.dispatchEvent(clickEvt)
+  a.remove()
+}
 
 function GameMenu() {
 
+  const [file, setFile] = React.useState<File>();
+
   const gameId = React.useContext(GameIdContext)
   const store = useStore()
 
@@ -18,24 +35,60 @@ function GameMenu() {
   const openEraseMenu = () => setEraseMenu(true);
   const closeEraseMenu = () => setEraseMenu(false);
 
+  const [uploadMenu, setUploadMenu] = React.useState(false);
+  const openUploadMenu = () => setUploadMenu(true);
+  const closeUploadMenu = () => setUploadMenu(false);
+
+  const gameProgress = useSelector(selectProgress(gameId))
+
   const dispatch = useAppDispatch()
 
-  const downloadProgress = () => {};
-  // const uploadProgress = () => {};
+  const downloadProgress = (e) => {
+    e.preventDefault()
+    downloadFile({
+      data: JSON.stringify(gameProgress),
+      fileName: `lean4game-${gameId}-${new Date().toLocaleDateString()}.json`,
+      fileType: 'text/json',
+    })
+  };
+
+  const handleFileChange = (e) => {
+    if (e.target.files) {
+      setFile(e.target.files[0]);
+    }
+
+  };
+
+  const uploadProgress = (e) => {
+    if (!file) {
+      return;
+    }
+
+    const fileReader = new FileReader();
+    fileReader.readAsText(file, "UTF-8");
+    fileReader.onload = (e) => {
+      const data = JSON.parse(e.target.result.toString()) as GameProgressState;
+      console.debug("Json Data", data);
+
+      dispatch(loadProgress({game: gameId, data: data}))
+    }
+
+    closeUploadMenu()
+  }
 
   const eraseProgress = () => {
     dispatch(deleteProgress({game: gameId}))
     closeEraseMenu()
   }
 
-  const downloadAndErase = () => {
-    downloadProgress ()
+  const downloadAndErase = (e) => {
+    downloadProgress(e)
     eraseProgress()
   }
 
   return <nav className="game-menu">
-    <Button disabled={true} onClick={downloadProgress} title="Download game progress" to=""><FontAwesomeIcon icon={faDownload} /></Button>
-    <Button disabled={true} title="Load game progress from JSON" to=""><FontAwesomeIcon icon={faUpload} /></Button>
+    <Button onClick={downloadProgress} title="Download game progress" to=""><FontAwesomeIcon icon={faDownload} /></Button>
+    <Button title="Load game progress from JSON" onClick={openUploadMenu} to=""><FontAwesomeIcon icon={faUpload} /></Button>
     <Button title="Clear game progress" to="" onClick={openEraseMenu}><FontAwesomeIcon icon={faEraser} /></Button>
 
     {eraseMenu?
@@ -45,15 +98,33 @@ function GameMenu() {
         <div className="codicon codicon-close modal-close" onClick={closeEraseMenu}></div>
         <h2>Delete Progress?</h2>
 
-        <p>Do you want to delete your saved state irreversibly?</p>
+        <p>Do you want to delete your saved progress irreversibly?</p>
         <p>(This only affects your saved proofs, no levels are ever locked.
           Saves from other games are not deleted.)</p>
 
         <Button onClick={eraseProgress} to="">Delete</Button>
-        <Button disabled={true} onClick={downloadAndErase} to="">Download & Delete</Button>
+        <Button onClick={downloadAndErase} to="">Download & Delete</Button>
         <Button onClick={closeEraseMenu} to="">Cancel</Button>
       </div>
     </div> : null}
+
+    {uploadMenu ?
+      <div className="modal-wrapper">
+      <div className="modal-backdrop" onClick={closeUploadMenu} />
+      <div className="modal">
+        <div className="codicon codicon-close modal-close" onClick={closeUploadMenu}></div>
+        <h2>Upload Saved Progress</h2>
+
+        <p>Select a JSON file with the saved game progress to load your progress.</p>
+
+        <p><b>Warning:</b> This will delete your current game progress!
+          Consider <a className="download-link" onClick={downloadProgress} >downloading your current progress</a> first!</p>
+
+        <input type="file" onChange={handleFileChange}/>
+
+        <Button to="" onClick={uploadProgress}>Load selected file</Button>
+      </div>
+    </div> : null}
   </nav>
 }
 
diff --git a/client/src/components/welcome.css b/client/src/components/welcome.css
index 9d07d01..93d4889 100644
--- a/client/src/components/welcome.css
+++ b/client/src/components/welcome.css
@@ -23,6 +23,10 @@
   padding: 20px;
 }
 
+i {
+  font-style: italic;
+}
+
 h1 {
   font-size: 2em;
   margin: .67em 0;
@@ -203,3 +207,10 @@ svg .world-title {
   margin-right: .4em;
   margin-bottom: .2em;
 }
+
+.modal a.download-link {
+  cursor: pointer;
+  font-style: italic;
+  text-decoration: underline dotted;
+
+}
diff --git a/client/src/state/api.ts b/client/src/state/api.ts
index 3569fcb..151af3b 100644
--- a/client/src/state/api.ts
+++ b/client/src/state/api.ts
@@ -50,7 +50,7 @@ const customBaseQuery = async (
     let leanClient = await connection.startLeanClient(args.game)
     console.log(`Sending request ${args.method}`)
     let res = await leanClient.sendRequest(args.method, args.params)
-    console.log('Received response', res)
+    console.log('Received response') //, res)
     return {'data': res}
    } catch (e) {
     return {'error': e}
diff --git a/client/src/state/progress.ts b/client/src/state/progress.ts
index ce43b4f..72816ff 100644
--- a/client/src/state/progress.ts
+++ b/client/src/state/progress.ts
@@ -2,8 +2,13 @@ import { createSlice } from '@reduxjs/toolkit'
 import type { PayloadAction } from '@reduxjs/toolkit'
 import { loadState } from "./localStorage";
 
+export interface GameProgressState {
+  [world: string] : {[level: number]: LevelProgressState}
+
+}
+
 interface ProgressState {
-  level: {[game: string]: {[world: string]: {[level: number]: LevelProgressState}}}
+  level: {[game: string]: GameProgressState}
 }
 interface Selection {
   selectionStartLineNumber: number,
@@ -52,6 +57,10 @@ export const progressSlice = createSlice({
     deleteProgress(state, action: PayloadAction<{game: string}>) {
       state.level[action.payload.game] = {}
     },
+    loadProgress(state, action: PayloadAction<{game: string, data:GameProgressState}>) {
+      console.debug(`setting data to:\n ${action.payload.data}`)
+      state.level[action.payload.game] = action.payload.data
+    },
   }
 })
 
@@ -82,10 +91,10 @@ export function selectCompleted(game: string, world: string, level: number) {
   }
 }
 
-export function selectProgress() {
+export function selectProgress(game: string) {
   return (state) => {
-    return state.progress
+    return state.progress.level[game] ?? null
   }
 }
 
-export const { changedSelection, codeEdited, levelCompleted, deleteProgress } = progressSlice.actions
+export const { changedSelection, codeEdited, levelCompleted, deleteProgress, loadProgress } = progressSlice.actions