diff --git a/.github/workflows/accuracy.yml b/.github/workflows/accuracy.yml
new file mode 100644
index 00000000..58b5e2d7
--- /dev/null
+++ b/.github/workflows/accuracy.yml
@@ -0,0 +1,79 @@
+name: Accuracy
+
+on: [push, pull_request, workflow_dispatch]
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch Source Code
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - name: Install Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y meson ninja-build libsdl2-dev libglew-dev libgtk-3-dev libreadline-dev libedit-dev libcapstone-dev
+      - name: Build Hades w/ Debugger
+        run: |
+          meson build --werror -Dwith_debugger=true
+          cd build
+          ninja
+      - name: Download Test Roms
+        run: |
+          # Download BIOS
+          echo "$BIOS_DATA" | base64 -d | gpg --pinentry-mode loopback --passphrase "$BIOS_KEY" -d -o ./bios.bin
+
+          # Create ROMs directory
+          mkdir roms
+          cd roms
+
+          # Download AGS
+          declare ags_url="$(echo "$AGS_URL" | base64 -d | gpg --pinentry-mode loopback --passphrase "$AGS_KEY" -d)"
+          wget "$ags_url" -O ags.zip
+          unzip ags.zip
+          shred -u ags.zip
+          mv AGB_*.gba ags.gba
+
+          # Download the remaining testing ROMs
+          wget https://raw.githubusercontent.com/jsmolka/gba-tests/master/arm/arm.gba
+          wget https://raw.githubusercontent.com/jsmolka/gba-tests/master/thumb/thumb.gba
+          wget https://raw.githubusercontent.com/Arignir/Hades-Tests/master/roms/dma-start-delay.gba
+          wget https://raw.githubusercontent.com/Arignir/Hades-Tests/master/roms/openbus-bios.gba
+          wget https://raw.githubusercontent.com/Arignir/Hades-Tests/master/roms/timer-basic.gba
+        env:
+          BIOS_DATA: ${{ secrets.BIOS_DATA }}
+          BIOS_KEY: ${{ secrets.BIOS_KEY }}
+          AGS_URL: ${{ secrets.AGS_URL }}
+          AGS_KEY: ${{ secrets.AGS_KEY }}
+      - name: Check Accuracy
+        run: |
+          # Setup a fake audio environment
+          export SDL_AUDIODRIVER=disk
+          ln -s /dev/null sdlaudio.raw
+
+          # Setup a fake X11 environment
+          export DISPLAY=:99
+          sudo Xvfb -ac "$DISPLAY" -screen 0 1280x1024x24 > /dev/null 2>&1 &
+
+          # Run accuracy checks
+          python3 ./accuracy/check.py --binary ./build/hades --roms ./roms/ -v
+      - name: Collect Screenshots
+        uses: actions/upload-artifact@v3
+        if: always()
+        with:
+          name: tests-screenshots
+          path: './.tests_screenshots/'
+          if-no-files-found: error
+      - name: Cleanup
+        if: always()
+        run: |
+          if [[ -f ./bios.bin ]]; then
+            shred -u ./bios.bin
+            echo "BIOS deleted"
+          fi
+
+          if [[ -f ./roms/ags.gba ]]; then
+            shred -u ./roms/ags.gba
+            echo "AGS deleted"
+          fi
diff --git a/.github/workflows/main.yml b/.github/workflows/build.yml
similarity index 96%
rename from .github/workflows/main.yml
rename to .github/workflows/build.yml
index dbae5ce3..54ed21d6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/build.yml
@@ -9,10 +9,10 @@ jobs:
       run:
         shell: msys2 {0}
     steps:
-      - name: 'Sync source code'
+      - name: Fetch Source Code
         uses: actions/checkout@v4
         with:
-          submodules: 'recursive'
+          submodules: recursive
       - name: Install Dependencies
         uses: msys2/setup-msys2@v2
         with:
@@ -35,10 +35,10 @@ jobs:
   mac-os:
     runs-on: macos-latest
     steps:
-      - name: 'Sync source code'
+      - name: Fetch Source Code
         uses: actions/checkout@v4
         with:
-          submodules: 'recursive'
+          submodules: recursive
       - name: Install Dependencies
         run: |
           brew install meson ninja sdl2 glew create-dmg
@@ -130,10 +130,10 @@ jobs:
   linux:
     runs-on: ubuntu-latest
     steps:
-      - name: 'Sync source code'
+      - name: Fetch Source Code
         uses: actions/checkout@v4
         with:
-          submodules: 'recursive'
+          submodules: recursive
       - name: Install Dependencies
         run: |
           sudo apt-get update
diff --git a/.gitignore b/.gitignore
index 22743602..32238b38 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,12 @@
 /screenshots
 /build
 /build.*
+/build-*
 /games
 /demos
 *.gba
 *.bin
+config.json
+.hades-dbg.history
+__pycache__
+
diff --git a/accuracy/__init__.py b/accuracy/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/accuracy/check.py b/accuracy/check.py
new file mode 100755
index 00000000..5513b7da
--- /dev/null
+++ b/accuracy/check.py
@@ -0,0 +1,152 @@
+#!/usr/bin/env python3
+
+import os
+import shutil
+import filecmp
+import textwrap
+import argparse
+import subprocess
+import tempfile
+from enum import Enum
+from pathlib import Path
+
+
+GREEN = '\033[32m'
+YELLOW = '\033[33m'
+RED = '\033[31m'
+BOLD = '\033[1m'
+RESET = '\033[0m'
+
+
+class TestResult(Enum):
+    PASS = 0
+    SKIP = 1
+    FAIL = 2
+
+
+class Test():
+    def __init__(self, name: str, rom: str, code: str, screenshot: str, skip: bool = False):
+        self.name = name
+
+        self.rom = rom
+        self.code = textwrap.dedent(code)
+        self.screenshot = screenshot
+        self.skip = skip
+
+    def run(self, hades_path: Path, rom_directory: Path, config_path: Path, tests_screenshots_directory: Path, verbose: bool):
+        module_path = Path(os.path.realpath(__file__)).parent
+
+        subprocess.run(
+            [hades_path, rom_directory / self.rom, '--without-gui', '--config', config_path],
+            input=self.code,
+            stdout=None if verbose else subprocess.DEVNULL,
+            stderr=None if verbose else subprocess.DEVNULL,
+            text=True,
+            encoding='utf-8',
+            check=True,
+        )
+
+        if not filecmp.cmp(tests_screenshots_directory / self.screenshot, module_path / 'expected' / self.screenshot, shallow=False):
+            raise RuntimeError("The screenshot taken during the test doesn't match the expected one.")
+
+
+def main():
+    from suite import TESTS_SUITE
+
+    exit_code = 0
+
+    parser = argparse.ArgumentParser(
+        prog='Hades Accuracy Checker',
+        description='Tests the accuracy of Hades, a Gameboy Advance Emulator',
+    )
+
+    parser.add_argument(
+        '--binary',
+        nargs='?',
+        default='./hades',
+        help="Path to Hades' binary",
+    )
+
+    parser.add_argument(
+        '--roms',
+        nargs='?',
+        default='./roms',
+        help="Path to the test ROMS folder",
+    )
+
+    parser.add_argument(
+        '--verbose',
+        '-v',
+        action='store_true',
+        help="Show subcommands output",
+    )
+
+    args = parser.parse_args()
+
+    hades_binary = Path(os.getcwd()) / args.binary
+    rom_directory = Path(os.getcwd()) / args.roms
+
+    config = tempfile.NamedTemporaryFile()
+    config.write(textwrap.dedent('''
+        {
+          "file": {
+            "bios": "./bios.bin"
+          },
+          "emulation": {
+            "skip_bios": true,
+            "speed": 0,
+            "unbounded": false,
+            "backup_storage": {
+              "autodetect": true,
+              "type": 0
+            },
+            "rtc": {
+              "autodetect": true,
+              "enabled": true
+            }
+          }
+        }
+    ''').encode('utf-8'))
+    config.flush()
+
+    tests_screenshots_directory = Path(os.getcwd()) / '.tests_screenshots'
+    if tests_screenshots_directory.exists():
+        shutil.rmtree(tests_screenshots_directory)
+    os.mkdir(tests_screenshots_directory)
+
+    print(f"┏━{'━' * 30}━┳━━━━━━┓")
+    print(f"┃ {'Name':30s} ┃ Res. ┃")
+    print(f"┣━{'━' * 30}━╋━━━━━━┫")
+
+    for test in TESTS_SUITE:
+        result = TestResult.FAIL
+
+        try:
+            if test.skip:
+                result = TestResult.SKIP
+                continue
+
+            test.run(hades_binary, rom_directory, config.name, tests_screenshots_directory, args.verbose)
+            result = TestResult.PASS
+        except Exception as e:
+            if args.verbose:
+                print(f"Error: {e}")
+            result = TestResult.FAIL
+        finally:
+            if result == TestResult.PASS:
+                pretty_result = f'{BOLD}{GREEN}PASS{RESET}'
+            elif result == TestResult.SKIP:
+                pretty_result = f'{BOLD}{YELLOW}SKIP{RESET}'
+            else:
+                pretty_result = f'{BOLD}{RED}FAIL{RESET}'
+                exit_code = 1
+
+            print(f"┃ {test.name:30s} ┃ {pretty_result} ┃")
+
+    print(f"┗━{'━' * 30}━┻━━━━━━┛")
+
+    exit(exit_code)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/accuracy/expected/ags_01.png b/accuracy/expected/ags_01.png
new file mode 100644
index 00000000..5ef7357b
Binary files /dev/null and b/accuracy/expected/ags_01.png differ
diff --git a/accuracy/expected/arm.png b/accuracy/expected/arm.png
new file mode 100644
index 00000000..512904da
Binary files /dev/null and b/accuracy/expected/arm.png differ
diff --git a/accuracy/expected/dma_start_delay.png b/accuracy/expected/dma_start_delay.png
new file mode 100644
index 00000000..75c961d0
Binary files /dev/null and b/accuracy/expected/dma_start_delay.png differ
diff --git a/accuracy/expected/openbus_bios.png b/accuracy/expected/openbus_bios.png
new file mode 100644
index 00000000..62797510
Binary files /dev/null and b/accuracy/expected/openbus_bios.png differ
diff --git a/accuracy/expected/thumb.png b/accuracy/expected/thumb.png
new file mode 100644
index 00000000..512904da
Binary files /dev/null and b/accuracy/expected/thumb.png differ
diff --git a/accuracy/expected/timer_basic.png b/accuracy/expected/timer_basic.png
new file mode 100644
index 00000000..f19b9e16
Binary files /dev/null and b/accuracy/expected/timer_basic.png differ
diff --git a/accuracy/suite.py b/accuracy/suite.py
new file mode 100644
index 00000000..6413ae0d
--- /dev/null
+++ b/accuracy/suite.py
@@ -0,0 +1,68 @@
+from typing import List
+from check import Test
+
+TESTS_SUITE: List[Test] = [
+
+    # Jsmolka's arm.gba & thumg.gba
+    # https://github.com/jsmolka/gba-tests
+    Test(
+        name="Jsmolka - Arm.gba",
+        rom='arm.gba',
+        code='''
+            frame 10
+            screenshot ./.tests_screenshots/arm.png
+        ''',
+        screenshot='arm.png',
+    ),
+    Test(
+        name="Jsmolka - Thumb.gba",
+        rom='thumb.gba',
+        code='''
+            frame 10
+            screenshot ./.tests_screenshots/thumb.png
+        ''',
+        screenshot='thumb.png',
+    ),
+
+    # Hades Tests
+    # https://github.com/Arignir/Hades-Tests
+    Test(
+        name="Hades Tests - DMA Start Delay",
+        rom='dma-start-delay.gba',
+        code='''
+            frame 20
+            screenshot ./.tests_screenshots/dma_start_delay.png
+        ''',
+        screenshot='dma_start_delay.png',
+        skip=True,
+    ),
+    Test(
+        name="Hades Tests - Openbus BIOS",
+        rom='openbus-bios.gba',
+        code='''
+            frame 20
+            screenshot ./.tests_screenshots/openbus_bios.png
+        ''',
+        screenshot='openbus_bios.png',
+    ),
+    Test(
+        name="Hades Tests - Timer Basic",
+        rom='timer-basic.gba',
+        code='''
+            frame 20
+            screenshot ./.tests_screenshots/timer_basic.png
+        ''',
+        screenshot='timer_basic.png',
+    ),
+
+    # AGS
+    Test(
+        name="AGS - Aging Tests",
+        rom='ags.gba',
+        code='''
+            frame 425
+            screenshot ./.tests_screenshots/ags_01.png
+        ''',
+        screenshot='ags_01.png',
+    )
+]
diff --git a/source/app/config.c b/source/app/config.c
index d166d97f..90dcd88f 100644
--- a/source/app/config.c
+++ b/source/app/config.c
@@ -72,7 +72,7 @@ app_config_load(
 
         if (mjson_get_number(data, data_len, "$.emulation.speed", &d)) {
             app->emulation.speed = (int)d;
-            app->emulation.speed = max(1, min(app->emulation.speed, 5));
+            app->emulation.speed = max(0, min(app->emulation.speed, 5));
         }
 
         if (mjson_get_bool(data, data_len, "$.emulation.backup_storage.autodetect", &b)) {
diff --git a/source/app/dbg/lang/lexer.c b/source/app/dbg/lang/lexer.c
index 567677c5..75c81bfc 100644
--- a/source/app/dbg/lang/lexer.c
+++ b/source/app/dbg/lang/lexer.c
@@ -66,6 +66,7 @@ debugger_lang_lexe(
     while (input[i]) {
         switch (input[i]) {
             case '.':
+            case '_':
             case 'a' ... 'z':
             case 'A' ... 'Z': {
                 /* Lexe the whole identifier */
@@ -73,7 +74,7 @@ debugger_lang_lexe(
                 size_t j;
 
                 j = 0;
-                while (isalnum(input[i + j]) || input[i + j] == '.' || input[i + j] == '/') {
+                while (isalnum(input[i + j]) || input[i + j] == '.' || input[i + j] == '_' || input[i + j] == '/') {
                     ++j;
                 }
 
diff --git a/source/app/main.c b/source/app/main.c
index ac96505d..39651975 100644
--- a/source/app/main.c
+++ b/source/app/main.c
@@ -104,6 +104,8 @@ main(
     logln(HS_INFO, "Welcome to Hades v" HADES_VERSION);
     logln(HS_INFO, "=========================");
 
+    return EXIT_SUCCESS;
+
     if (app.args.with_gui) {
         app_sdl_init(&app);
 
@@ -158,7 +160,7 @@ main(
         uint64_t sdl_counters[2];
         float elapsed_ms;
 
-        sdl_counters[0] = SDL_GetPerformanceCounter();
+        sdl_counters[0] = 0; //SDL_GetPerformanceCounter();
 
         app_emulator_process_all_notifs(&app);