diff --git a/client/src/App.tsx b/client/src/App.tsx
index 67cfc92..4ed7abd 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -35,7 +35,7 @@ function App() {
     setCurLevel(1)
   }
 
-  const title = useAppSelector(state => state.game.title)
+  const title = ""//useAppSelector(state => state.gameApi.data.title)
 
   return (
     <div className="App">
diff --git a/client/src/components/Level.tsx b/client/src/components/Level.tsx
index 0e00f68..e094771 100644
--- a/client/src/components/Level.tsx
+++ b/client/src/components/Level.tsx
@@ -110,7 +110,7 @@ function Level() {
 
   // The next function will be called when the level changes
   useEffect(() => {
-    connection.whenLeanClientStarted((leanClient) => {
+    connection.startLeanClient().then((leanClient) => {
       if (editor) {
 
         const model = monaco.editor.createModel('', 'lean4', monaco.Uri.parse(uri))
diff --git a/client/src/components/Welcome.tsx b/client/src/components/Welcome.tsx
index b032375..fe9f79c 100644
--- a/client/src/components/Welcome.tsx
+++ b/client/src/components/Welcome.tsx
@@ -6,24 +6,18 @@ import '@fontsource/roboto/300.css';
 import '@fontsource/roboto/400.css';
 import '@fontsource/roboto/500.css';
 import '@fontsource/roboto/700.css';
-import * as rpc from 'vscode-ws-jsonrpc';
 import cytoscape from 'cytoscape'
 import klay from 'cytoscape-klay';
-import { useSelector, useDispatch } from 'react-redux'
-import { fetchGame } from '../game/gameSlice'
 import { Link as RouterLink, useNavigate } from 'react-router-dom';
 
 
 cytoscape.use( klay );
 
 import { Box, Typography, Button, CircularProgress, Grid } from '@mui/material';
-import { LeanClient } from 'lean4web/client/src/editor/leanclient';
-import { ConnectionContext } from '../connection';
-import { useAppDispatch, useAppSelector } from '../hooks';
+import { useGetGameInfoQuery } from '../game/api';
 
 
 function Welcome() {
-  const dispatch = useAppDispatch()
   const navigate = useNavigate();
 
   const worldsRef = useRef<HTMLDivElement>(null)
@@ -75,23 +69,25 @@ function Welcome() {
     });
   }
 
-  useEffect(() => { dispatch(fetchGame); }, [])
+  const gameInfo = useGetGameInfoQuery()
 
-  const worlds = useAppSelector(state => state.game.worlds)
-  useEffect(() => { if (worlds) { drawWorlds(worlds); } }, [worlds])
+  useEffect(() => {
+    if (gameInfo.data?.worlds) { drawWorlds(gameInfo.data.worlds); }
+  }, [gameInfo.data?.worlds])
 
-  const title = useAppSelector(state => state.game.title)
-  useEffect(() => { window.document.title = title }, [title])
-
-  const introduction = useAppSelector(state => state.game.introduction)
+  useEffect(() => {
+    if (gameInfo.data?.title) window.document.title = gameInfo.data.title
+  }, [gameInfo.data?.title])
 
   return <div>
-  { introduction?// TODO: find a better way to mark loading state?
+  { gameInfo.isLoading?
+    <Box display="flex" alignItems="center" justifyContent="center" sx={{ height: "calc(100vh - 64px)" }}><CircularProgress /></Box>
+    :
     <div>
       <Box sx={{ m: 3 }}>
         <Typography variant="body1" component="div">
           <MathJax>
-            <ReactMarkdown>{introduction}</ReactMarkdown>
+            <ReactMarkdown>{gameInfo.data.introduction}</ReactMarkdown>
           </MathJax>
         </Typography>
       </Box>
@@ -100,7 +96,6 @@ function Welcome() {
       </Box>
       <div ref={worldsRef} style={{"width": "100%","height": "50em"}} />
     </div>
-    : <Box display="flex" alignItems="center" justifyContent="center" sx={{ height: "calc(100vh - 64px)" }}><CircularProgress /></Box>
   }
 
   </div>
diff --git a/client/src/connection.ts b/client/src/connection.ts
index 5382b49..73c96b5 100644
--- a/client/src/connection.ts
+++ b/client/src/connection.ts
@@ -18,17 +18,21 @@ export class Connection {
     return this.leanClient
   }
 
-  /** Call `callback` when the leanClient has started. If not already started, start it. */
-  whenLeanClientStarted = (callback) => {
-    const leanClient = this.getLeanClient()
-    if (leanClient.isRunning()) {
-      callback(leanClient)
-    } else {
-      if (!leanClient.isStarted()) {
-        leanClient.start()
+  /** If not already started, starts the Lean client. resolves the returned promise as soon as a
+   * Lean client is running.
+   */
+  startLeanClient = () => {
+    return new Promise<LeanClient>((resolve) => {
+      const leanClient = this.getLeanClient()
+      if (leanClient.isRunning()) {
+        resolve(leanClient)
+      } else {
+        if (!leanClient.isStarted()) {
+          leanClient.start()
+        }
+       leanClient.restarted(() => { resolve(leanClient) })
       }
-     leanClient.restarted(() => { callback(leanClient) })
-    }
+    })
   }
 }
 
diff --git a/client/src/game/api.ts b/client/src/game/api.ts
new file mode 100644
index 0000000..c23e18e
--- /dev/null
+++ b/client/src/game/api.ts
@@ -0,0 +1,38 @@
+import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react'
+import { Connection } from '../connection'
+
+interface GameState {
+  title: null|string,
+  introduction: null|string,
+  worlds: null|{nodes: string[], edges: string[][2]},
+  authors: null|string[],
+  conclusion: null|string,
+}
+
+const customBaseQuery = async (
+  args : {method: string, params?: any},
+  { signal, dispatch, getState, extra },
+  extraOptions
+) => {
+  const connection : Connection = extra.connection
+  let leanClient = await connection.startLeanClient()
+  console.log(`Sending request ${args.method}`)
+  let res = await leanClient.sendRequest(args.method, args.params)
+  console.log('Received response', res)
+  return {'data': res}
+}
+
+// Define a service using a base URL and expected endpoints
+export const gameApi = createApi({
+  reducerPath: 'gameApi',
+  baseQuery: customBaseQuery,
+  endpoints: (builder) => ({
+    getGameInfo: builder.query<GameState, void>({
+      query: () => {return {method: 'info', params: {}}},
+    }),
+  }),
+})
+
+// Export hooks for usage in functional components, which are
+// auto-generated based on the defined endpoints
+export const { useGetGameInfoQuery } = gameApi
diff --git a/client/src/game/gameSlice.ts b/client/src/game/gameSlice.ts
deleted file mode 100644
index 798e2cb..0000000
--- a/client/src/game/gameSlice.ts
+++ /dev/null
@@ -1,48 +0,0 @@
-import { createSlice, PayloadAction } from '@reduxjs/toolkit'
-import { LeanClient } from 'lean4web/client/src/editor/leanclient'
-import { Connection } from '../connection'
-import type { RootState } from '../store'
-
-interface GameState {
-  title: null|string,
-  introduction: null|string,
-  worlds: null|{nodes: string[], edges: string[][2]},
-  authors: null|string[],
-  conclusion: null|string,
-}
-
-const initialState : GameState = {
-  title: null,
-  introduction: null,
-  worlds: null,
-  authors: null,
-  conclusion: null,
-}
-
-export const gameSlice = createSlice({
-  name: 'game',
-  initialState,
-  reducers: {
-    loadedGame: (state, action: PayloadAction<any>) => {
-      state.title = action.payload.title
-      state.introduction = action.payload.introduction
-      state.worlds = action.payload.worlds
-      state.authors = action.payload.authors
-      state.conclusion = action.payload.conclusion
-    },
-  },
-})
-
-export const { loadedGame } = gameSlice.actions
-
-
-export const fetchGame = (dispatch, getState, extraArgument) => {
-  const connection : Connection = extraArgument.connection
-  connection.whenLeanClientStarted(() => {
-    connection.getLeanClient().sendRequest("info", {}).then((res) =>{
-      dispatch(loadedGame(res))
-    })
-  })
-}
-
-export default gameSlice.reducer
diff --git a/client/src/store.ts b/client/src/store.ts
index ce09847..1e6b216 100644
--- a/client/src/store.ts
+++ b/client/src/store.ts
@@ -1,21 +1,19 @@
 import { configureStore } from '@reduxjs/toolkit';
-import gameReducer from './game/gameSlice';
 import { connection } from './connection'
 import thunkMiddleware from 'redux-thunk'
+import { gameApi } from './game/api'
 
 
-const thunkMiddlewareWithArg = thunkMiddleware.withExtraArgument({ connection })
-
 export const store = configureStore({
   reducer: {
-    game: gameReducer,
+    [gameApi.reducerPath]: gameApi.reducer,
   },
   middleware: getDefaultMiddleware =>
     getDefaultMiddleware({
       thunk: {
         extraArgument: { connection }
       }
-    })
+    }).concat(gameApi.middleware),
 });
 
 // Infer the `RootState` and `AppDispatch` types from the store itself