diff --git a/callbacks.py b/callbacks.py
index 182c3c1..311f094 100644
--- a/callbacks.py
+++ b/callbacks.py
@@ -4,13 +4,11 @@
 NoitaMonitorCallback  — episode stats, Telegram alerts, W&B logging, Rich table
 """
 
-from __future__ import annotations
 
 import os
 import time
 import csv
 from collections import deque
-from typing import Optional
 
 import glob
 import numpy as np
diff --git a/config.py b/config.py
index 90e11cf..622c5e1 100644
--- a/config.py
+++ b/config.py
@@ -1,8 +1,7 @@
-from __future__ import annotations
 
 from typing import Optional
 from pydantic_settings import BaseSettings, SettingsConfigDict
-from pydantic import Field, field_validator
+from pydantic import Field
 
 
 class Config(BaseSettings):
diff --git a/eval.py b/eval.py
index 4fca783..0be0eb9 100644
--- a/eval.py
+++ b/eval.py
@@ -8,7 +8,6 @@
     python eval.py model.zip --slow 0.5   # run at 50% speed (sleep 50ms between steps)
 """
 
-from __future__ import annotations
 
 import argparse
 import sys
diff --git a/notify.py b/notify.py
index 0b1050f..47783ab 100644
--- a/notify.py
+++ b/notify.py
@@ -8,7 +8,6 @@
   • Graceful no-op   — if token / chat_id are empty, every method silently returns
 """
 
-from __future__ import annotations
 
 import io
 import threading
@@ -23,6 +22,18 @@
 from PIL import Image, ImageDraw, ImageFont
 
 
+
+_cached_font = None
+def _get_font():
+    global _cached_font
+    if _cached_font is None:
+        try:
+            from PIL import ImageFont
+            _cached_font = ImageFont.truetype("arial.ttf", 24)
+        except IOError:
+            _cached_font = ImageFont.load_default()
+    return _cached_font
+
 class TelegramNotifier:
     def __init__(self, token: str, chat_id: str):
         self._token    = token
@@ -188,10 +199,7 @@ def make_death_postcard(png_bytes: bytes, stats_text: str) -> bytes:
         try:
             img = Image.open(io.BytesIO(png_bytes)).convert("RGB")
             draw = ImageDraw.Draw(img)
-            try:
-                font = ImageFont.truetype("arial.ttf", 24)
-            except IOError:
-                font = ImageFont.load_default()
+            font = _get_font()
                 
             # Add a semi-transparent black rectangle at the bottom
             width, height = img.size
@@ -337,8 +345,7 @@ def register_stats_provider(self, fn: Callable[[], str]) -> None:
         """fn() should return a formatted string of current training stats."""
         self._stats_fn = fn
 
-    @staticmethod
-    def _find_noita_hwnd() -> Optional[int]:
+    def _find_noita_hwnd(self) -> "int | None":
         """
         Return HWND of the Noita game window, matched by process executable
         (noita.exe / noita_dev.exe) so browser tabs with 'noita' in their title
@@ -350,6 +357,12 @@ def _find_noita_hwnd() -> Optional[int]:
 
             k32    = ctypes.windll.kernel32
             user32 = ctypes.windll.user32
+
+            # Check if cached hwnd is still valid
+            if hasattr(self, '_cached_hwnd') and self._cached_hwnd is not None:
+                if user32.IsWindow(self._cached_hwnd):
+                    return self._cached_hwnd
+                self._cached_hwnd = None
             PROCESS_QUERY_LIMITED = 0x1000
 
             found: list = []
@@ -381,7 +394,10 @@ def _cb(hwnd, _):
                 return True
 
             user32.EnumWindows(_cb, 0)
-            return found[0] if found else None
+            if found:
+                self._cached_hwnd = found[0]
+                return found[0]
+            return None
         except Exception:
             return None
 
@@ -466,10 +482,7 @@ def capture_noita_screen(self, overlay_text: str = "") -> bytes:
 
             if overlay_text:
                 draw = ImageDraw.Draw(img)
-                try:
-                    font = ImageFont.truetype("arial.ttf", 24)
-                except IOError:
-                    font = ImageFont.load_default()
+                font = _get_font()
                 text_bbox = draw.textbbox((10, 10), overlay_text, font=font)
                 draw.rectangle(
                     [text_bbox[0]-5, text_bbox[1]-5, text_bbox[2]+5, text_bbox[3]+5],
diff --git a/tests/test_callbacks.py b/tests/test_callbacks.py
new file mode 100644
index 0000000..f097592
--- /dev/null
+++ b/tests/test_callbacks.py
@@ -0,0 +1,20 @@
+import pytest
+from unittest.mock import MagicMock, patch
+from callbacks import NoitaMonitorCallback
+
+
+def test_callbacks_init():
+    mock_env = MagicMock()
+    mock_env.envs = [MagicMock()]
+    mock_env.envs[0].port = 1234
+
+    with patch("callbacks.TelegramNotifier", create=True) as mock_notifier:
+        with patch("callbacks.VideoRecorder", create=True) as mock_recorder:
+            mock_cfg = MagicMock()
+            cb = NoitaMonitorCallback(
+                cfg=mock_cfg,
+                notifier=mock_notifier,
+                verbose=0,
+                recorder=mock_recorder
+            )
+            assert cb is not None
diff --git a/tests/test_eval.py b/tests/test_eval.py
new file mode 100644
index 0000000..d416c4e
--- /dev/null
+++ b/tests/test_eval.py
@@ -0,0 +1,50 @@
+import pytest
+import os
+import io
+import torch
+import torch.nn as nn
+from unittest.mock import patch, MagicMock
+
+# Assuming eval.py has calculate_thinking which uses torch
+try:
+    from eval import calculate_thinking
+except ImportError:
+    calculate_thinking = None
+
+@pytest.mark.skipif(calculate_thinking is None, reason="calculate_thinking not found")
+def test_calculate_thinking():
+    # Create a mock model with features_extractor that returns some tensor
+    class MockExtractor(nn.Module):
+        def forward(self, obs):
+            # simulate features extraction
+            return torch.ones((1, 64))
+
+    class MockDistribution:
+        def __init__(self, obs):
+            # simulate 4 discrete actions
+            self.probs = torch.tensor([[0.1, 0.2, 0.6, 0.1]])
+            # Make sure logits require grad and are connected to obs
+            self.logits = obs.mean() * torch.tensor([[1.0, 2.0, 6.0, 1.0]], requires_grad=True)
+
+    class MockPolicy(nn.Module):
+        def get_distribution(self, obs):
+            dist = MagicMock()
+            dist.distribution = MockDistribution(obs)
+            return dist
+
+    class MockModel:
+        def __init__(self):
+            self.policy = MockPolicy()
+            self.device = torch.device('cpu')
+
+    model = MockModel()
+
+    # Create a dummy observation
+    obs = torch.zeros((1, 3, 64, 64)).numpy()
+
+    # Run calculation
+    # calculate_thinking takes (model, obs) and returns something (probably a tensor or float)
+    saliency = calculate_thinking(model, obs)
+
+    # Just check it returns something without crashing
+    assert saliency is not None
diff --git a/tests/test_noita_env.py b/tests/test_noita_env.py
new file mode 100644
index 0000000..d35946e
--- /dev/null
+++ b/tests/test_noita_env.py
@@ -0,0 +1,48 @@
+import pytest
+from unittest.mock import MagicMock, patch
+import asyncio
+
+def make_env():
+    import importlib, types, sys
+
+    # Mock problematic modules
+    sys.modules['mss'] = MagicMock()
+    sys.modules['pygetwindow'] = MagicMock()
+    sys.modules['pyrect'] = MagicMock()
+
+    import noita_env
+    importlib.reload(noita_env)
+
+    env = noita_env.NoitaEnv.__new__(noita_env.NoitaEnv)
+    env._lock = MagicMock()
+    env._ws = MagicMock()
+    env._sct = MagicMock()
+    env._frame_buf = []
+    env.port = 1234
+    return env
+
+class TestNoitaEnvMethods:
+    def test_render_does_not_crash(self):
+        env = make_env()
+        # Should do nothing and not crash
+        env.render()
+
+    def test_close_clears_ws(self):
+        env = make_env()
+        env._ws = MagicMock()
+        assert env._ws is not None
+        env.close()
+        assert env._ws is None
+        env._lock.__enter__.assert_called()
+
+    def test_handle_exception_path(self):
+        env = make_env()
+        env._ws = None
+        # Create a mock socket
+        mock_ws = MagicMock()
+        mock_ws.recv.side_effect = Exception("Connection closed")
+
+        # Should gracefully exit the loop when exception is caught
+        asyncio.run(env._handle(mock_ws))
+        # Should set _ws to None on exit
+        assert env._ws is None
diff --git a/tests/test_notify.py b/tests/test_notify.py
index 2d7ff60..26711ac 100644
--- a/tests/test_notify.py
+++ b/tests/test_notify.py
@@ -1,3 +1,4 @@
+from unittest.mock import patch
 """
 Tests for TelegramNotifier.
 
@@ -185,3 +186,22 @@ def test_register_stats_provider(self, noop):
         noop.register_stats_provider(lambda: "stats text")
         assert noop._stats_fn is not None
         assert noop._stats_fn() == "stats text"
+
+# ---------------------------------------------------------------------------
+# AI Status
+# ---------------------------------------------------------------------------
+
+class TestAIStatus:
+    def test_empty_groq_key(self, noop):
+        result = noop.generate_ai_status(groq_key="", stats_context="Test stats")
+        assert result == "⚠️ Groq API key not set. Please set GROQ_API_KEY in .env."
+
+    def test_empty_groq_key_none(self, noop):
+        result = noop.generate_ai_status(groq_key=None, stats_context="Test stats")
+        assert result == "⚠️ Groq API key not set. Please set GROQ_API_KEY in .env."
+
+class TestSetupBotMenu:
+    def test_setup_bot_menu_error(self, fake):
+        with patch('requests.post', side_effect=Exception('Mock API Error')):
+            # Should not crash
+            fake.setup_bot_menu()
diff --git a/tests/test_offline_analysis.py b/tests/test_offline_analysis.py
new file mode 100644
index 0000000..807403b
--- /dev/null
+++ b/tests/test_offline_analysis.py
@@ -0,0 +1,24 @@
+import pytest
+import os
+import json
+from unittest.mock import patch, mock_open
+
+from offline_analysis import analyze_actions
+
+def test_analyze_actions():
+    mock_data = '{"episode": 1, "action": [1, 0, 0, 0], "reward": 10.0, "ep_reward": 10.0, "total_steps": 1}\n'
+
+    with patch('builtins.open', mock_open(read_data=mock_data)):
+        with patch('offline_analysis.os.path.exists', return_value=True):
+            with patch('offline_analysis.plt') as mock_plt:
+                analyze_actions()
+
+                assert mock_plt.figure.call_count > 0
+                assert mock_plt.savefig.call_count > 0
+
+def test_analyze_actions_no_file():
+    with patch('offline_analysis.os.path.exists', return_value=False):
+        # Should print and return early
+        with patch('builtins.print') as mock_print:
+            analyze_actions()
+            mock_print.assert_called_once()
diff --git a/tests/test_train.py b/tests/test_train.py
new file mode 100644
index 0000000..e819b42
--- /dev/null
+++ b/tests/test_train.py
@@ -0,0 +1,53 @@
+import os
+import pytest
+from unittest.mock import patch, MagicMock
+
+from config import Config
+from train import setup_logging, setup_wandb
+
+@pytest.fixture
+def mock_config():
+    cfg = MagicMock(spec=Config)
+    cfg.checkpoint_dir = "/tmp/checkpoints"
+    cfg.tensorboard_dir = "/tmp/tb"
+    cfg.log_level = "INFO"
+    cfg.log_dir = "/tmp/logs"
+    cfg.wandb_project = "noita-rl"
+    cfg.wandb_entity = "jules"
+    cfg.wandb_enabled = True
+    cfg.n_envs = 1
+    cfg.total_timesteps = 1000
+    cfg.learning_rate = 0.001
+    cfg.n_steps = 2048
+    cfg.batch_size = 64
+    cfg.n_epochs = 10
+    cfg.gamma = 0.99
+    cfg.ent_coef = 0.01
+    return cfg
+
+def test_setup_logging(tmp_path, mock_config):
+    mock_config.checkpoint_dir = str(tmp_path / "checkpoints")
+    mock_config.tensorboard_dir = str(tmp_path / "tb")
+
+    with patch("train.logger") as mock_logger, patch("sys.stderr"):
+        setup_logging(mock_config, "test_run")
+
+        # Verify logger.add was called
+        assert mock_logger.add.call_count > 0
+
+def test_setup_wandb_enabled(mock_config):
+    with patch("train.wandb.init", create=True) as mock_init:
+        setup_wandb(mock_config, "test_run")
+        mock_init.assert_called_once()
+
+def test_setup_wandb_disabled(mock_config):
+    mock_config.wandb_enabled = False
+    with patch("train.wandb.init", create=True) as mock_init:
+        setup_wandb(mock_config, "test_run")
+        mock_init.assert_not_called()
+
+def test_setup_wandb_error(mock_config):
+    with patch("train.wandb.init", side_effect=Exception("WandB Error"), create=True) as mock_init, \
+         patch("train.logger.warning") as mock_warn:
+        setup_wandb(mock_config, "test_run")
+        mock_warn.assert_called_once()
diff --git a/tests/test_train_multi.py b/tests/test_train_multi.py
new file mode 100644
index 0000000..d0ec9bb
--- /dev/null
+++ b/tests/test_train_multi.py
@@ -0,0 +1,27 @@
+import pytest
+from unittest.mock import patch, MagicMock
+from train_multi import find_latest_checkpoint
+
+def test_find_latest_checkpoint_empty_dir(tmp_path):
+    assert find_latest_checkpoint(str(tmp_path)) is None
+
+def test_find_latest_checkpoint_no_match(tmp_path):
+    (tmp_path / "other_run_100_steps.txt").touch()
+    assert find_latest_checkpoint(str(tmp_path)) is None
+
+def test_find_latest_checkpoint_single_match(tmp_path):
+    f = tmp_path / "test_run_100_steps.zip"
+    f.touch()
+    assert find_latest_checkpoint(str(tmp_path)) == str(f)
+
+def test_find_latest_checkpoint_multiple_matches(tmp_path):
+    f1 = tmp_path / "test_run_100_steps.zip"
+    f2 = tmp_path / "test_run_200_steps.zip"
+    f3 = tmp_path / "test_run_50_steps.zip"
+    import time
+    f1.touch()
+    time.sleep(0.01)
+    f3.touch()
+    time.sleep(0.01)
+    f2.touch()
+    assert find_latest_checkpoint(str(tmp_path)) == str(f2)
diff --git a/tests/test_video_recorder.py b/tests/test_video_recorder.py
index 0825c62..48d7aaf 100644
--- a/tests/test_video_recorder.py
+++ b/tests/test_video_recorder.py
@@ -109,6 +109,12 @@ def test_fallback_returns_nonempty_string(self, recorder, event_name):
         assert isinstance(result, str)
         assert len(result) > 5
 
+
+    @pytest.mark.parametrize("event_name", ALL_EVENTS)
+    def test_trigger_does_not_crash_on_empty_ctx(self, recorder, event_name):
+        recorder.trigger_event(event_name, {})
+        assert not recorder._event_q.empty()
+
     @pytest.mark.parametrize("event_name", ALL_EVENTS)
     def test_fallback_does_not_crash_on_empty_ctx(self, recorder, event_name):
         result = recorder._groq_describe(event_name, {})
@@ -237,3 +243,35 @@ def test_active_event_none_initially(self, recorder):
 
     def test_pre_buffer_starts_empty(self, recorder):
         assert len(recorder._pre_buf) == 0
+
+# ---------------------------------------------------------------------------
+# State Tests
+# ---------------------------------------------------------------------------
+
+class TestStateProperties:
+    def test_is_idle(self, recorder):
+        assert recorder.is_idle is True
+        recorder._state = "recording"
+        assert recorder.is_idle is False
+        recorder._state = "cooldown"
+        assert recorder.is_idle is False
+
+    def test_status(self, recorder):
+        assert recorder.status == "idle"
+        recorder._state = "recording"
+        assert recorder.status == "recording"
+        recorder._state = "cooldown"
+        assert recorder.status == "cooldown"
+
+    def test_force_trigger(self, recorder):
+        recorder._state = "cooldown" # Set to cooldown
+        assert recorder.is_idle is False
+
+        # force_trigger should bypass cooldown
+        recorder.force_trigger("force_event", {"info": "data"})
+
+        # It should place the event on the queue regardless of cooldown state
+        assert not recorder._event_q.empty()
+        item = recorder._event_q.get_nowait()
+        assert item["name"] == "force_event"
+        assert item["ctx"] == {"info": "data"}
diff --git a/train.py b/train.py
index 96fa4cd..baaaf35 100644
--- a/train.py
+++ b/train.py
@@ -8,11 +8,15 @@
     python train.py --name "experiment-01"
 """
 
-from __future__ import annotations
+
 
 import argparse
 import os
 import sys
+import wandb
+
+
+
 
 # Workaround for OpenMP duplicate library error
 os.environ["KMP_DUPLICATE_LIB_OK"] = "TRUE"
diff --git a/video_recorder.py b/video_recorder.py
index da6d3ce..e3c493e 100644
--- a/video_recorder.py
+++ b/video_recorder.py
@@ -1,3 +1,4 @@
+from collections import deque
 """
 VideoRecorder — event-triggered highlight recorder for NoitaRL.
 
@@ -29,7 +30,7 @@
   wand_kill            — wand shot killed an enemy
 """
 
-from __future__ import annotations
+
 
 import collections
 import io
@@ -564,8 +565,8 @@ def _read_recent_logs(n_lines: int = 30) -> str:
         log_path = os.path.join(os.path.dirname(__file__), "logger.txt")
         try:
             with open(log_path, "r", encoding="utf-8", errors="replace") as f:
-                lines = f.readlines()
-            return "".join(lines[-n_lines:]).strip()
+                lines = deque(f, maxlen=n_lines)
+            return "".join(lines).strip()
         except Exception:
             return ""
 
@@ -575,8 +576,8 @@ def _read_recent_actions(n: int = 20) -> str:
         trace_path = os.path.join(os.path.dirname(__file__), "actions_trace.jsonl")
         try:
             with open(trace_path, "r", encoding="utf-8", errors="replace") as f:
-                lines = f.readlines()
-            return "".join(lines[-n:]).strip()
+                lines = deque(f, maxlen=n)
+            return "".join(lines).strip()
         except Exception:
             return ""