diff --git a/skillopt/envs/alfworld/rollout.py b/skillopt/envs/alfworld/rollout.py
index 8c3b4ac..18264c3 100644
--- a/skillopt/envs/alfworld/rollout.py
+++ b/skillopt/envs/alfworld/rollout.py
@@ -7,12 +7,10 @@ Provides:
 """
 from __future__ import annotations
 
+import concurrent.futures
 import json
 import os
 import re
-import sys
-import concurrent.futures
-import numpy as np
 
 from skillopt.model import chat_target
 
@@ -65,6 +63,25 @@ def _append_diagnostic_instruction(prompt: str, diagnostic_instruction: str) ->
     return f"{prompt}\n\n## Training Readout\n{diagnostic_instruction.strip()}\n"
 
 
+def _resolve_alfworld_gamefile(gamefile: str) -> str:
+    path = os.path.expanduser(os.path.expandvars(str(gamefile)))
+    if os.path.isabs(path):
+        return path
+
+    data_root = os.environ.get("ALFWORLD_DATA", "").strip()
+    if not data_root:
+        return path
+
+    root = os.path.expanduser(os.path.expandvars(data_root))
+    return os.path.abspath(os.path.join(root, path))
+
+
+def _resolve_alfworld_gamefiles(gamefiles: list[str] | None) -> list[str] | None:
+    if gamefiles is None:
+        return None
+    return [_resolve_alfworld_gamefile(gamefile) for gamefile in gamefiles]
+
+
 # ── Environment builder ──────────────────────────────────────────────────────
 
 
@@ -86,9 +103,10 @@ def build_alfworld_env(
     Returns:
         env_manager: AlfWorldEnvironmentManager instance
     """
-    from omegaconf import OmegaConf
     from functools import partial
 
+    from omegaconf import OmegaConf
+
     from skillopt.envs.alfworld.vendor.alfworld_envs import build_alfworld_envs
     from skillopt.envs.alfworld.vendor.alfworld_projection import alfworld_projection
     from skillopt.envs.alfworld.vendor.env_manager import AlfWorldEnvironmentManager
@@ -97,6 +115,7 @@ def build_alfworld_env(
 
     alf_config_path = os.path.join(HERE, "vendor", "config_tw.yaml")
     env_kwargs = {"eval_dataset": eval_dataset}
+    resolved_gamefiles = _resolve_alfworld_gamefiles(specific_gamefiles)
 
     envs = build_alfworld_envs(
         alf_config_path,
@@ -106,7 +125,7 @@ def build_alfworld_env(
         is_train=is_train,
         env_kwargs=env_kwargs,
         resources_per_worker=None,
-        gamefiles=specific_gamefiles,
+        gamefiles=resolved_gamefiles,
     )
 
     config = OmegaConf.create(
@@ -222,7 +241,7 @@ def run_alfworld_batch(
                 if _extract_action(response) is None:
                     return idx, "<think>missing action tag</think><action>look</action>"
                 return idx, response
-            except Exception as e:
+            except Exception:
                 return idx, "<think>error</think><action>look</action>"
 
         executor = concurrent.futures.ThreadPoolExecutor(max_workers=max_api_workers)
diff --git a/tests/test_alfworld_paths.py b/tests/test_alfworld_paths.py
new file mode 100644
index 0000000..eb0229b
--- /dev/null
+++ b/tests/test_alfworld_paths.py
@@ -0,0 +1,33 @@
+import os
+
+from skillopt.envs.alfworld.rollout import _resolve_alfworld_gamefile, _resolve_alfworld_gamefiles
+
+
+def test_resolve_alfworld_gamefile_uses_alfworld_data_for_relative_paths(monkeypatch, tmp_path):
+    data_root = tmp_path / "alfworld_data"
+    monkeypatch.setenv("ALFWORLD_DATA", str(data_root))
+
+    resolved = _resolve_alfworld_gamefile("json_2.1.1/valid_seen/task/game.tw-pddl")
+
+    assert resolved == os.path.join(str(data_root), "json_2.1.1/valid_seen/task/game.tw-pddl")
+
+
+def test_resolve_alfworld_gamefile_keeps_absolute_paths(monkeypatch, tmp_path):
+    monkeypatch.setenv("ALFWORLD_DATA", str(tmp_path / "alfworld_data"))
+    absolute = tmp_path / "elsewhere" / "game.tw-pddl"
+
+    assert _resolve_alfworld_gamefile(str(absolute)) == str(absolute)
+
+
+def test_resolve_alfworld_gamefile_keeps_relative_path_without_alfworld_data(monkeypatch):
+    monkeypatch.delenv("ALFWORLD_DATA", raising=False)
+
+    assert _resolve_alfworld_gamefile("json_2.1.1/train/task/game.tw-pddl") == (
+        "json_2.1.1/train/task/game.tw-pddl"
+    )
+
+
+def test_resolve_alfworld_gamefiles_handles_none(monkeypatch):
+    monkeypatch.setenv("ALFWORLD_DATA", "/tmp/alfworld_data")
+
+    assert _resolve_alfworld_gamefiles(None) is None