diff --git a/.eslintrc.js b/.eslintrc.js
index 9ed873a92..b8bf36d70 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -55,5 +55,15 @@ module.exports = {
         "@typescript-eslint/prefer-literal-enum-member": ["off"],
       },
     },
+    /**
+     * TypeScript requires the "var" keyword within "declare global" to correctly merge variables into the global
+     * namespace.
+     */
+    {
+      files: ["**/*.d.ts"],
+      rules: {
+        "no-var": "off",
+      },
+    },
   ],
 };
diff --git a/electron/global.d.ts b/electron/global.d.ts
new file mode 100644
index 000000000..e0ec34aaf
--- /dev/null
+++ b/electron/global.d.ts
@@ -0,0 +1,23 @@
+import type { BrowserWindow } from "electron";
+
+declare global {
+  var steamworksError: Error | undefined;
+  var app_handlers: {
+    stopProcess: (window: BrowserWindow) => void;
+  };
+  namespace Electron {
+    interface BrowserWindow {
+      gameInfo?: {
+        player?: {
+          identifier: string;
+          playtime: number;
+          lastSave: number;
+        };
+        game?: {
+          version: string;
+          hash: string;
+        };
+      };
+    }
+  }
+}
diff --git a/electron/menu.js b/electron/menu.js
index 99f181128..4b7c15bbd 100644
--- a/electron/menu.js
+++ b/electron/menu.js
@@ -357,13 +357,12 @@ function getMenu(window) {
           label: "Delete Steam Cloud Data",
           enabled: steamworksClient !== undefined,
           click: () => {
-            if (steamworksClient.cloud.listFiles().length === 0) {
+            if (steamworksClient === undefined || steamworksClient.cloud.listFiles().length === 0) {
+              log.info("There is no Steam cloud file");
               return;
             }
             try {
-              if (!storage.deleteCloudFile()) {
-                log.warn("Cannot delete Steam Cloud data");
-              }
+              storage.deleteCloudFiles();
             } catch (error) {
               log.error(error);
             }
diff --git a/electron/package-lock.json b/electron/package-lock.json
index 9a40a3966..324181a4f 100644
--- a/electron/package-lock.json
+++ b/electron/package-lock.json
@@ -8,7 +8,7 @@
       "name": "bitburner",
       "version": "3.0.0",
       "dependencies": {
-        "@catloversg/steamworks.js": "0.0.2",
+        "@catloversg/steamworks.js": "0.0.3",
         "arg": "^5.0.2",
         "electron-log": "^4.4.8",
         "electron-store": "^8.1.0",
@@ -16,9 +16,9 @@
       }
     },
     "node_modules/@catloversg/steamworks.js": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/@catloversg/steamworks.js/-/steamworks.js-0.0.2.tgz",
-      "integrity": "sha512-EPB7vQFZa0zGw+Ft4SHiHIDZ7UcuM/XUiyzPo5a9Pf+g5XmcvjIEjo8wKwk7Ox0DOjmSJ+s8GmOD/TDDQW5jgg==",
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/@catloversg/steamworks.js/-/steamworks.js-0.0.3.tgz",
+      "integrity": "sha512-fQhWQ0FNuFgO7zC1t009+jiPUTBL0VeH6pxYDMbEaauRw64o6wy4lGG9gJ9Rq+Rp/wXKs/BqNMFPLpdxRXprRQ==",
       "license": "MIT",
       "dependencies": {
         "@types/node": "*"
diff --git a/electron/package.json b/electron/package.json
index f3bf1d7f7..e2005bd7b 100755
--- a/electron/package.json
+++ b/electron/package.json
@@ -24,7 +24,7 @@
     "buildResources": "public"
   },
   "dependencies": {
-    "@catloversg/steamworks.js": "0.0.2",
+    "@catloversg/steamworks.js": "0.0.3",
     "arg": "^5.0.2",
     "electron-log": "^4.4.8",
     "electron-store": "^8.1.0",
diff --git a/electron/saveDataBinaryFormat.d.ts b/electron/saveDataBinaryFormat.d.ts
index fa7274fd2..2508a3226 100644
--- a/electron/saveDataBinaryFormat.d.ts
+++ b/electron/saveDataBinaryFormat.d.ts
@@ -1,4 +1,4 @@
-export declare const encodeBytesToBase64String: (bytes: Uint8Array<ArrayBuffer>) => string;
-export declare const decodeBase64BytesToBytes: (bytes: Uint8Array<ArrayBuffer>) => Uint8Array<ArrayBuffer>;
-export declare const isBinaryFormat: (saveData: string | Uint8Array<ArrayBuffer>) => boolean;
-export declare const isSteamCloudFormat: (saveData: string | Uint8Array<ArrayBuffer>) => boolean;
+export declare const encodeBytesToBase64String: (bytes: Uint8Array<ArrayBufferLike>) => string;
+export declare const decodeBase64BytesToBytes: (bytes: Uint8Array<ArrayBufferLike>) => Uint8Array<ArrayBuffer>;
+export declare const isBinaryFormat: (saveData: string | Uint8Array<ArrayBufferLike>) => boolean;
+export declare const isSteamCloudFormat: (saveData: string | Uint8Array<ArrayBufferLike>) => boolean;
diff --git a/electron/steamworksUtils.js b/electron/steamworksUtils.js
index dfee6eba4..c933b73d7 100644
--- a/electron/steamworksUtils.js
+++ b/electron/steamworksUtils.js
@@ -2,17 +2,21 @@
 const steamworks = require("@catloversg/steamworks.js");
 const log = require("electron-log");
 
-let steamworksClient;
+/** @type {ReturnType<typeof import("@catloversg/steamworks.js").init> | undefined} */
+let steamworksClient = undefined;
 try {
   // 1812820 is our Steam App ID.
   steamworksClient = steamworks.init(1812820);
 } catch (error) {
-  if (error.message?.includes("Steam is probably not running")) {
+  if (error instanceof Error) {
     log.warn(error.message);
+    global.steamworksError = error;
   } else {
-    log.warn(error);
+    // This should never happen.
+    log.error("steamworks.js threw an error that is not an instance of Error");
+    log.error(error);
+    global.steamworksError = new Error(typeof error === "string" ? error : String(error), { cause: error });
   }
-  global.steamworksError = error;
 }
 
 module.exports = {
diff --git a/electron/storage.js b/electron/storage.js
index 47304eefb..33b50ddce 100644
--- a/electron/storage.js
+++ b/electron/storage.js
@@ -1,3 +1,5 @@
+/** @import { BrowserWindow } from "electron" */
+/** @typedef {string | Uint8Array} SaveData */
 /* eslint-disable @typescript-eslint/no-var-requires */
 const { app, ipcMain } = require("electron");
 const path = require("path");
@@ -10,6 +12,7 @@ const { decodeBase64BytesToBytes, isBinaryFormat, isSteamCloudFormat } = require
 const store = new Store();
 const { steamworksClient } = require("./steamworksUtils");
 
+/** @param {string} directory */
 // https://stackoverflow.com/a/69418940
 const dirSize = async (directory) => {
   const files = await fs.readdir(directory);
@@ -17,6 +20,7 @@ const dirSize = async (directory) => {
   return (await Promise.all(stats)).reduce((accumulator, { size }) => accumulator + size, 0);
 };
 
+/** @param {string} directory */
 const getDirFileStats = async (directory) => {
   const files = await fs.readdir(directory);
   const stats = files.map((f) => {
@@ -27,11 +31,13 @@ const getDirFileStats = async (directory) => {
   return data;
 };
 
+/** @param {string} directory */
 const getNewestFile = async (directory) => {
   const data = await getDirFileStats(directory);
   return data.sort((a, b) => b.stat.mtime.getTime() - a.stat.mtime.getTime())[0];
 };
 
+/** @param {BrowserWindow} window */
 const getAllSaves = async (window) => {
   const rootDirectory = getSaveFolder(window, true);
   const data = await fs.readdir(rootDirectory, { withFileTypes: true });
@@ -44,6 +50,7 @@ const getAllSaves = async (window) => {
   return flat;
 };
 
+/** @param {BrowserWindow} window */
 async function prepareSaveFolders(window) {
   const rootFolder = getSaveFolder(window, true);
   const currentFolder = getSaveFolder(window);
@@ -51,12 +58,15 @@ async function prepareSaveFolders(window) {
   await prepareFolders(rootFolder, currentFolder, backupsFolder);
 }
 
+/** @param {...string} folders */
 async function prepareFolders(...folders) {
   for (const folder of folders) {
     try {
       // Making sure the folder exists
       await fs.stat(folder);
     } catch (error) {
+      // @ts-expect-error - Node.js guarantees that errors thrown by its APIs are instances of the standard Error class
+      // and include an error.code property.
       if (error.code === "ENOENT") {
         log.warn(`'${folder}' not found, creating it...`);
         await fs.mkdir(folder);
@@ -67,6 +77,9 @@ async function prepareFolders(...folders) {
   }
 }
 
+// TODO: Check callers of this function. They currently don't properly handle the case where this function returns
+// undefined due to errors when reading folder stats.
+/** @param {string} saveFolder */
 async function getFolderSizeInBytes(saveFolder) {
   try {
     return await dirSize(saveFolder);
@@ -75,6 +88,7 @@ async function getFolderSizeInBytes(saveFolder) {
   }
 }
 
+/** @param {boolean} value */
 function setAutosaveConfig(value) {
   store.set("autosave-enabled", value);
 }
@@ -83,6 +97,7 @@ function isAutosaveEnabled() {
   return store.get("autosave-enabled", true);
 }
 
+/** @param {boolean} value */
 function setCloudEnabledConfig(value) {
   store.set("cloud-enabled", value);
 }
@@ -91,14 +106,20 @@ function isMenuHideEnabled() {
   return store.get("autoHideMenuBar", false);
 }
 
+/** @param {boolean} value */
 function setMenuHideConfig(value) {
   return store.set("autoHideMenuBar", value);
 }
 
+/**
+ * @param {BrowserWindow} window
+ * @param {boolean} [root]
+ */
 function getSaveFolder(window, root = false) {
   if (root) {
     return path.join(app.getPath("userData"), "/saves");
   }
+  // TODO: check undefined gameInfo case
   const identifier = window.gameInfo?.player?.identifier ?? "";
   return path.join(app.getPath("userData"), "/saves", `/${identifier}`);
 }
@@ -126,30 +147,93 @@ function isCloudEnabled() {
   return true;
 }
 
+/**
+ * @param {string} name
+ * @param {string} content
+ */
 function saveCloudFile(name, content) {
-  steamworksClient.cloud.writeFile(name, content);
+  if (!steamworksClient) {
+    return;
+  }
+  const result = steamworksClient.cloud.writeFile(name, content);
+  if (!result) {
+    log.warn(`Cannot write Steam Cloud save file: ${name}`);
+  }
 }
 
-function getFilenameOfFirstCloudFile() {
+/** @param {import("@catloversg/steamworks.js/client").cloud.FileInfo[]} files */
+function logCloudFiles(files) {
+  for (const file of files) {
+    log.debug(
+      `Name: ${file.name}. Size: ${file.size}. ` +
+        `isFilePersisted: ${steamworksClient?.cloud.isFilePersisted(file.name)}. ` +
+        `timestamp: ${steamworksClient?.cloud.fileTimestamp(file.name)}`,
+    );
+  }
+}
+
+function getFilenameOfMostRecentlyPersistedCloudFile() {
+  if (!steamworksClient) {
+    return null;
+  }
   const files = steamworksClient.cloud.listFiles();
   if (files.length === 0) {
-    throw new Error("No files in cloud");
+    return null;
   }
-  const file = files[0];
-  log.silly(`Found ${files.length} files.`);
-  log.silly(`First File: ${file.name} (${file.size} bytes)`);
+  const filteredFiles = files
+    // @ts-expect-error - https://github.com/microsoft/TypeScript/issues/9998
+    .filter((file) => steamworksClient.cloud.isFilePersisted(file.name))
+    .map((file) => ({
+      file,
+      // @ts-expect-error - https://github.com/microsoft/TypeScript/issues/9998
+      timestamp: steamworksClient.cloud.fileTimestamp(file.name),
+    }))
+    .sort((a, b) => b.timestamp - a.timestamp)
+    .map((item) => item.file);
+  if (filteredFiles.length === 0) {
+    log.warn("Found cloud file(s) but none are persisted");
+    logCloudFiles(files);
+    return null;
+  }
+  if (filteredFiles.length > 1) {
+    log.warn("Found more than 1 persisted cloud file");
+    logCloudFiles(files);
+  }
+  const file = filteredFiles[0];
+  log.debug(`Found ${filteredFiles.length} files.`);
+  log.debug(`First File: ${file.name} (${file.size} bytes)`);
   return file.name;
 }
 
 function getCloudFile() {
-  return steamworksClient.cloud.readFile(getFilenameOfFirstCloudFile());
+  if (!steamworksClient) {
+    return null;
+  }
+  const filename = getFilenameOfMostRecentlyPersistedCloudFile();
+  if (filename === null) {
+    return null;
+  }
+  return steamworksClient.cloud.readFile(filename);
 }
 
-function deleteCloudFile() {
-  return steamworksClient.cloud.deleteFile(getFilenameOfFirstCloudFile());
+function deleteCloudFiles() {
+  if (!steamworksClient) {
+    return;
+  }
+  for (const file of steamworksClient.cloud.listFiles()) {
+    if (steamworksClient.cloud.deleteFile(file.name)) {
+      log.info(`Deleted Steam cloud file: ${file.name}`);
+    } else {
+      log.warn(`Cannot delete Steam cloud file: ${file.name}`);
+    }
+  }
 }
 
+/** @param {string} currentPlayerId */
 async function backupSteamDataToDisk(currentPlayerId) {
+  if (!steamworksClient) {
+    return;
+  }
   const files = steamworksClient.cloud.listFiles();
   if (files.length === 0) {
     return;
@@ -169,16 +253,24 @@ async function backupSteamDataToDisk(currentPlayerId) {
  * The name of save file is `${currentPlayerId}.json.gz`. The content of save file is weird: it's a base64 string of the
  * binary data of compressed json save string. It's weird because the extension is .json.gz while the content is a
  * base64 string. Check the comments in the implementation to see why it is like that.
+ *
+ * @param {SaveData} saveData
+ * @param {string} currentPlayerId
+ * @returns
  */
 async function pushSaveDataToSteamCloud(saveData, currentPlayerId) {
+  // TODO: Check whether we really need to throw an error here or if we can log and return.
   if (!isCloudEnabled()) {
-    return Promise.reject("Steam Cloud is not Enabled");
+    throw new Error("Steam Cloud is not enabled");
   }
 
+  // TODO: Refactor this function and backupSteamDataToDisk. backupSteamDataToDisk is not really useful (it tries to
+  // back up the first cloud file). In the case of having multiple cloud files, calling backupSteamDataToDisk and
+  // saveCloudFile like this is useless.
   try {
     await backupSteamDataToDisk(currentPlayerId);
   } catch (error) {
-    log.error(error);
+    log.error("Cannot back up Steam data to disk", error);
   }
 
   const steamSaveName = `${currentPlayerId}.json.gz`;
@@ -202,7 +294,7 @@ async function pushSaveDataToSteamCloud(saveData, currentPlayerId) {
   try {
     saveCloudFile(steamSaveName, content);
   } catch (error) {
-    log.error(error);
+    log.error("Cannot save cloud file", error);
   }
 }
 
@@ -211,16 +303,25 @@ async function pushSaveDataToSteamCloud(saveData, currentPlayerId) {
  */
 async function getSteamCloudSaveData() {
   if (!isCloudEnabled()) {
-    return Promise.reject("Steam Cloud is not Enabled");
+    throw new Error("Steam Cloud is not enabled");
   }
-  log.debug(`Fetching Save in Steam Cloud`);
+  log.debug("Fetching Save in Steam Cloud");
   const cloudString = getCloudFile();
+  // TODO: Refactor this function and its callers. Not having a cloud file is a valid case.
+  if (cloudString === null) {
+    throw new Error("Cannot get cloud file");
+  }
   // Decode cloudString to get save data back.
   const saveData = Buffer.from(cloudString, "base64");
   log.debug(`SaveData: ${saveData.length} bytes`);
   return saveData;
 }
 
+/**
+ * @param {BrowserWindow} window
+ * @param {{save: SaveData, fileName: string}} electronGameData
+ * @returns
+ */
 async function saveGameToDisk(window, electronGameData) {
   const currentFolder = getSaveFolder(window);
   let saveFolderSizeBytes = await getFolderSizeInBytes(currentFolder);
@@ -269,6 +370,7 @@ async function saveGameToDisk(window, electronGameData) {
   return file;
 }
 
+/** @param {BrowserWindow} window */
 async function loadLastFromDisk(window) {
   const folder = getSaveFolder(window);
   const last = await getNewestFile(folder);
@@ -276,6 +378,7 @@ async function loadLastFromDisk(window) {
   return loadFileFromDisk(last.file);
 }
 
+/** @param {string} path */
 async function loadFileFromDisk(path) {
   const buffer = await fs.readFile(path);
   let content;
@@ -293,47 +396,60 @@ async function loadFileFromDisk(path) {
   return content;
 }
 
+/**
+ * @param {BrowserWindow} window
+ * @param {SaveData} save
+ */
 function getSaveInformation(window, save) {
   return new Promise((resolve) => {
-    ipcMain.once("get-save-info-response", (event, data) => {
+    ipcMain.once("get-save-info-response", (__event, data) => {
       resolve(data);
     });
     window.webContents.send("get-save-info-request", save);
   });
 }
 
+/** @param {BrowserWindow} window */
 function getCurrentSave(window) {
   return new Promise((resolve) => {
-    ipcMain.once("get-save-data-response", (event, data) => {
+    ipcMain.once("get-save-data-response", (__event, data) => {
       resolve(data);
     });
     window.webContents.send("get-save-data-request");
   });
 }
 
+/**
+ * @param {BrowserWindow} window
+ * @param {SaveData} save
+ * @param {boolean} automatic
+ */
 function pushSaveGameForImport(window, save, automatic) {
-  ipcMain.once("push-import-result", (event, arg) => {
+  ipcMain.once("push-import-result", (__event, arg) => {
     log.debug(`Was save imported? ${arg.wasImported ? "Yes" : "No"}`);
   });
   window.webContents.send("push-save-request", { save, automatic });
 }
 
+/** @param {BrowserWindow} window */
 async function restoreIfNewerExists(window) {
   const currentSave = await getCurrentSave(window);
   const currentData = await getSaveInformation(window, currentSave.save);
   const steam = {};
   const disk = {};
 
-  try {
-    steam.save = await getSteamCloudSaveData();
-    steam.data = await getSaveInformation(window, steam.save);
-  } catch (error) {
-    log.error("Could not retrieve steam file");
-    log.debug(error);
+  if (isCloudEnabled()) {
+    // TODO: Check if we can refactor to avoid using a try-catch block.
+    try {
+      steam.save = await getSteamCloudSaveData();
+      steam.data = await getSaveInformation(window, steam.save);
+    } catch (error) {
+      log.error("Could not retrieve Steam cloud file", error);
+    }
   }
 
   try {
-    const saves = (await getAllSaves()).sort((a, b) => b.stat.mtime.getTime() - a.stat.mtime.getTime());
+    const saves = (await getAllSaves(window)).sort((a, b) => b.stat.mtime.getTime() - a.stat.mtime.getTime());
     if (saves.length > 0) {
       disk.save = await loadFileFromDisk(saves[0].file);
       disk.data = await getSaveInformation(window, disk.save);
@@ -388,7 +504,7 @@ module.exports = {
   pushSaveGameForImport,
   pushSaveDataToSteamCloud,
   getSteamCloudSaveData,
-  deleteCloudFile,
+  deleteCloudFiles,
   saveGameToDisk,
   loadLastFromDisk,
   loadFileFromDisk,