for (let t_id in game.things) {
let t = game.things[t_id];
if (t.position[0] == this.position[0] && t.position[1] == this.position[1]) {
for (let t_id in game.things) {
let t = game.things[t_id];
if (t.position[0] == this.position[0] && t.position[1] == this.position[1]) {