diff --git a/js/main-editor.js b/js/main-editor.js
index 350807d..7ca3e79 100644
--- a/js/main-editor.js
+++ b/js/main-editor.js
@@ -1,3 +1,5 @@
+import * as fflate from 'https://unpkg.com/fflate/esm/index.mjs';
+
 import { DIRECTIONS, TICS_PER_SECOND } from './defs.js';
 import { TILES_WITH_PROPS } from './editor-tile-overlays.js';
 import * as format_base from './format-base.js';
@@ -2549,7 +2551,7 @@ export class Editor extends PrimaryView {
         if (this.stored_level) {
             this.save_button.disabled = ! this.conductor.stored_game.editor_metadata;
         }
-        _make_button("Download", ev => {
+        _make_button("Download level as C2M", ev => {
             // TODO also allow download as CCL
             // TODO support getting warnings + errors out of synthesis
             let buf = c2g.synthesize_level(this.stored_level);
@@ -2568,6 +2570,66 @@ export class Editor extends PrimaryView {
                 URL.revokeObjectURL(url);
             }, 60 * 1000);
         });
+        _make_button("Download pack", ev => {
+            let stored_pack = this.conductor.stored_game;
+
+            // This is pretty heckin' best-effort for now; TODO move into format-c2g?
+            let lines = [];
+            let safe_title = (stored_pack.title || "untitled").replace(/[""]/g, "'").replace(/[\x00-\x1f]+/g, "_");
+            lines.push(`game "${safe_title}"`);
+
+            let files = {};
+            let count = stored_pack.level_metadata.length;
+            let levelnumlen = String(count).length;
+            for (let [i, meta] of stored_pack.level_metadata.entries()) {
+                let c2m;
+                if (i === this.conductor.level_index) {
+                    // Use the current state of the current level even if it's not been saved
+                    c2m = new Uint8Array(c2g.synthesize_level(this.stored_level));
+                }
+                else if (meta.key) {
+                    // This is already in localStorage as a c2m
+                    c2m = fflate.strToU8(localStorage.getItem(meta.key), true);
+                }
+                else {
+                    let stored_level = stored_pack.load_level(i);
+                    c2m = new Uint8Array(c2g.synthesize_level(stored_level));
+                }
+
+                let safe_title = meta.title.replace(/[\x00-\x1f<>:""\/\\|?*]+/g, '_');
+                let dirchunk = i - i % 50;
+                let dirname = (
+                    String(dirchunk + 1).padStart(levelnumlen, '0') + '-' +
+                    String(Math.min(count, dirchunk + 50)).padStart(levelnumlen, '0'));
+                let filename = `${dirname}/${i + 1} - ${safe_title}.c2m`;
+                files[filename] = c2m;
+
+                lines.push(`map "${filename}"`);
+            }
+
+            // TODO utf8 encode this
+            safe_title = safe_title.replace(/[\x00-\x1f<>:""\/\\|?*]+/g, '_');
+            lines.push("");
+            files[safe_title + '.c2g'] = fflate.strToU8(lines.join("\n"));
+            let u8array = fflate.zipSync(files);
+
+            // TODO also allow download as CCL
+            // TODO support getting warnings + errors out of synthesis
+            let blob = new Blob([u8array]);
+            let url = URL.createObjectURL(blob);
+            // To download a file, um, make an <a> and click it.  Not kidding
+            let a = mk('a', {
+                href: url,
+                download: (stored_pack.title || 'untitled') + '.zip',
+            });
+            document.body.append(a);
+            a.click();
+            // Absolutely no idea when I'm allowed to revoke this, but surely a minute is safe
+            window.setTimeout(() => {
+                a.remove();
+                URL.revokeObjectURL(url);
+            }, 60 * 1000);
+        });
         _make_button("Share", ev => {
             let data = util.b64encode(c2g.synthesize_level(this.stored_level));
             let url = new URL(location);