diff --git a/game/sim/saveLoad.py b/game/sim/saveLoad.py
new file mode 100644
index 0000000..e5307c1
--- /dev/null
+++ b/game/sim/saveLoad.py
@@ -0,0 +1,118 @@
+import json
+
+
+def captureState(world):
+    player = world.player
+    return {
+        "level": world.level.name,
+        "frame": world.frame,
+        "score": world.score,
+        "coins": world.coins,
+        "lives": world.lives,
+        "gameOver": world.gameOver,
+        "completed": world.completed,
+        "active": world.active,
+        "activatedCheckpoints": sorted(world.activatedCheckpoints),
+        "player": {
+            "x": player.x,
+            "y": player.y,
+            "vx": player.vx,
+            "vy": player.vy,
+            "hp": player.hp,
+            "maxHp": player.maxHp,
+            "facing": player.facing,
+            "score": player.score,
+            "coins": player.coins,
+            "iframes": player.iframes,
+            "airJumps": player.airJumps,
+            "spawnX": player.spawnX,
+            "spawnY": player.spawnY,
+            "inventory": player.inventory.asDict(),
+        },
+        "items": [item.collected for item in world.items],
+        "enemies": [
+            {
+                "kind": enemy.kind,
+                "x": enemy.x,
+                "y": enemy.y,
+                "vx": enemy.vx,
+                "vy": enemy.vy,
+                "direction": enemy.direction,
+                "alive": enemy.alive,
+                "hp": enemy.hp,
+                "state": enemy.machine.stateName,
+            }
+            for enemy in world.enemies
+        ],
+        "platforms": [
+            {
+                "progress": platform.progress,
+                "direction": platform.direction,
+                "x": platform.x,
+                "y": platform.y,
+            }
+            for platform in world.platforms
+        ],
+    }
+
+
+def applyState(world, state):
+    world.frame = state["frame"]
+    world.score = state["score"]
+    world.coins = state["coins"]
+    world.lives = state["lives"]
+    world.gameOver = state["gameOver"]
+    world.completed = state["completed"]
+    world.active = state.get("active", True)
+    world.activatedCheckpoints = set(state["activatedCheckpoints"])
+
+    player = world.player
+    saved = state["player"]
+    player.x = saved["x"]
+    player.y = saved["y"]
+    player.vx = saved["vx"]
+    player.vy = saved["vy"]
+    player.hp = saved["hp"]
+    player.maxHp = saved["maxHp"]
+    player.facing = saved["facing"]
+    player.score = saved["score"]
+    player.coins = saved["coins"]
+    player.iframes = saved["iframes"]
+    player.airJumps = saved["airJumps"]
+    player.spawnX = saved["spawnX"]
+    player.spawnY = saved["spawnY"]
+    player.inventory.loadDict(saved["inventory"])
+
+    for item, collected in zip(world.items, state["items"]):
+        item.collected = collected
+
+    for enemy, record in zip(world.enemies, state["enemies"]):
+        enemy.x = record["x"]
+        enemy.y = record["y"]
+        enemy.vx = record["vx"]
+        enemy.vy = record["vy"]
+        enemy.direction = record["direction"]
+        enemy.alive = record["alive"]
+        enemy.hp = record["hp"]
+        stateName = record["state"]
+        if stateName is not None and stateName in enemy.machine.states:
+            enemy.machine.current = enemy.machine.states[stateName]
+
+    for platform, record in zip(world.platforms, state["platforms"]):
+        platform.progress = record["progress"]
+        platform.direction = record["direction"]
+        platform.x = record["x"]
+        platform.y = record["y"]
+
+    return world
+
+
+def saveGame(world, path):
+    with open(path, "w", encoding="ascii") as handle:
+        json.dump(captureState(world), handle, indent=2)
+
+
+def loadGameInto(world, path):
+    with open(path, "r", encoding="ascii") as handle:
+        state = json.load(handle)
+    return applyState(world, state)