diff --git a/test/langtons-ant.nas b/test/langtons-ant.nas
new file mode 100644
index 0000000..9eed9a9
--- /dev/null
+++ b/test/langtons-ant.nas
@@ -0,0 +1,97 @@
+use std.unix;
+
+srand();
+
+var ant = {
+    new: func(color, pos_x, pos_y) {
+        return {
+            move: int(rand()*4),
+            color: color,
+            pos_x: pos_x,
+            pos_y: pos_y
+        };
+    }
+};
+
+# generate agents
+var ants = [
+    ant.new(10, 30, 15),
+    ant.new(11, 31, 16),
+    ant.new(4, 29, 13),
+    ant.new(9, 30, 14),
+    ant.new(13, 30, 12),
+    ant.new(99, 25, 18)
+];
+
+# initialize game map
+var map = [];
+var map_color = [];
+setsize(map, 60*30);
+setsize(map_color, 60*30);
+forindex(var i; map) {
+    map[i] = 0;
+    map_color[i] = 0;
+}
+foreach(var a; ants) {
+    map_color[a.pos_x + a.pos_y*60] = a.color;
+}
+
+var print_map = func {
+    var res = "\e[1;1H";
+    for(var y = 0; y<30; y += 1) {
+        for(var x = 0; x<60; x += 1) {
+            res ~= "\e[38;5;"~map_color[x + y*60]~";1m";
+            res ~= map[x + y*60] ~ " \e[0m";
+        }
+        res ~= "\n";
+    }
+    print(res);
+}
+
+var move = func {
+    var move_step = [
+        [0, -1],
+        [1, 0],
+        [0, 1],
+        [-1, 0]
+    ];
+    var temp_map = [];
+    setsize(temp_map, 60*30);
+    forindex(var i; map) {
+        temp_map[i] = map[i];
+    }
+    foreach(var a; ants) {
+        var map_state = map[a.pos_x + a.pos_y*60];
+        temp_map[a.pos_x + a.pos_y*60] = map_state==0? 1:0;
+        if (map_state==1) {
+            a.move -= 1;
+            if (a.move < 0) {
+                a.move = 3;
+            }
+        } else {
+            a.move += 1;
+            if (a.move > 3) {
+                a.move = 0;
+            }
+        }
+        a.pos_x += move_step[a.move][0];
+        a.pos_y += move_step[a.move][1];
+        if (a.pos_x < 0) { a.pos_x = 59; }
+        if (a.pos_x > 59) { a.pos_x = 0; }
+        if (a.pos_y < 0) { a.pos_y = 29; }
+        if (a.pos_y > 29) { a.pos_y = 0; }
+
+        if (map_color[a.pos_x + a.pos_y*60]!=a.color) {
+            map_color[a.pos_x + a.pos_y*60] = a.color;
+        } else {
+            map_color[a.pos_x + a.pos_y*60] = 0;
+        }
+    }
+    map = temp_map;
+}
+
+while(1) {
+    print_map();
+    move();
+    unix.sleep(1/24);
+}
\ No newline at end of file