diff --git a/js/main.mjs b/js/main.mjs
index c7840c2..1713631 100644
--- a/js/main.mjs
+++ b/js/main.mjs
@@ -1,5 +1,5 @@
 import * as graphics from "./graphics.mjs";
-import { BOX_SIZE, get_tile } from "./world.mjs";
+import { BOX_SIZE, get_tile, get_root } from "./world.mjs";
 import { get_player_box } from "./player.mjs";
 import { save_in_browser, load_from_browser } from "./save_load.mjs";
 import { tick } from "/js/tile_update.mjs";
@@ -21,7 +21,7 @@ function main (timestamp) {
 	const delta = dt_ms / 1000;
 
 	render(delta);
-	tick(delta);
+	tick(get_root(), delta);
 
 	requestAnimationFrame(main);
 }
diff --git a/js/tile_update.mjs b/js/tile_update.mjs
index 1b9ba76..d95f146 100644
--- a/js/tile_update.mjs
+++ b/js/tile_update.mjs
@@ -6,8 +6,7 @@ import * as random from "/js/utils/random.mjs";
 
 // lots of this code is very hacky temporary for testing things out & getting started with tile updates.
 
-export function tick (delta_time) {
-	const box = get_player_box();
+export function tick (box, delta_time) {
 	world.for_each_tile(box, (x, y, tile) => {
 		if (tile_tickers.has(tile.type)) {
 			tile_tickers.get(tile.type)(box, x, y, delta_time);
@@ -24,6 +23,11 @@ const dirs = [
 	[ 0, 1 ],
 ];
 
+// this might become terrible for performance eventually.
+tile_tickers.set("box", (box, x, y, delta_time) => {
+	tick(world.get_tile(box, x, y).box, delta_time);
+});
+
 tile_tickers.set("grass", (box, x, y, delta_time) => {
 	const tile = world.get_tile(box, x, y);
 	if (Math.random() > 0.8 ** delta_time) {