diff --git a/Utils.py b/Utils.py
index e8fd73d..9c7cd5a 100644
--- a/Utils.py
+++ b/Utils.py
@@ -3,9 +3,13 @@ import subprocess
 import sys
 import typing
 import functools
+import hashlib
 
+from asar import init as asar_init, close as asar_close, patch as asar_patch, geterrors as asar_errors
 from yaml import load, dump
 
+JAP10HASH = '03a63945398191337e896e5771f77173'
+
 try:
     from yaml import CLoader as Loader
 except ImportError:
@@ -49,14 +53,9 @@ local_path.cached_path = None
 
 
 
-def make_new_base2current(old_rom='../alttp.sfc', new_rom='../working.sfc'):
+def make_new_base2current(old_rom_data, new_rom_data):
     from collections import OrderedDict
     import json
-    import hashlib
-    with open(old_rom, 'rb') as stream:
-        old_rom_data = bytearray(stream.read())
-    with open(new_rom, 'rb') as stream:
-        new_rom_data = bytearray(stream.read())
     # extend to 2 mb
     old_rom_data.extend(bytearray([0x00]) * (2097152 - len(old_rom_data)))
 
@@ -77,5 +76,40 @@ def make_new_base2current(old_rom='../alttp.sfc', new_rom='../working.sfc'):
 
 
 if __name__ == '__main__':
-    print(make_new_base2current())
+    try:
+        asar_init()
+        print("Asar DLL initialized")
+        
+        print("Opening Base rom")
+        with open('../alttp.sfc', 'rb') as stream:
+            old_rom_data = bytearray(stream.read())
+            
+        if len(old_rom_data) % 0x400 == 0x200:
+            old_rom_data = old_rom_data[0x200:]
+            
+        basemd5 = hashlib.md5()
+        basemd5.update(old_rom_data)
+        if JAP10HASH != basemd5.hexdigest():
+            raise Exception("Base rom is not 'Zelda no Densetsu - Kamigami no Triforce (J) (V1.0)'")
+            
+        print("Patching Base Rom")
+        result, new_rom_data = asar_patch('LTTP_RND_GeneralBugfixes.asm', old_rom_data)
+        
+        if result:
+            with open('../working.sfc', 'wb') as stream:
+                stream.write(new_rom_data)
+            print("Success\n")
+            print(make_new_base2current(old_rom_data, new_rom_data))        
+        else:
+            errors = asar_errors()
+            print("\nErrors: " + str(len(errors)))
+            for error in errors:
+                print (error)
+        
+        asar_close()
+    except:
+        import traceback
+        traceback.print_exc()
+    
+    input("Press enter to close")
 
diff --git a/asar-x64.dll b/asar-x64.dll
new file mode 100644
index 0000000..4c34b5e
Binary files /dev/null and b/asar-x64.dll differ
diff --git a/asar.dll b/asar.dll
new file mode 100644
index 0000000..0e769e4
Binary files /dev/null and b/asar.dll differ
diff --git a/asar.exe b/asar.exe
deleted file mode 100644
index c861df6..0000000
Binary files a/asar.exe and /dev/null differ
diff --git a/asar.py b/asar.py
new file mode 100644
index 0000000..b88e548
--- /dev/null
+++ b/asar.py
@@ -0,0 +1,421 @@
+#!/usr/bin/env python3
+"""
+python interface for asar.dll
+by randomdude999
+
+Usage: import asar, call asar.init, call asar.patch, then use the various
+functions to get info about the patch
+"""
+
+import ctypes
+import enum
+import sys
+from ctypes import c_int, c_char_p, POINTER
+c_int_ptr = POINTER(c_int)
+
+__all__ = ["errordata", "writtenblockdata", "mappertype", "version",
+           "apiversion", "init", "reset", "patch", "maxromsize", "close",
+           "geterrors", "getwarnings", "getprints", "getalllabels",
+           "getlabelval", "getdefine", "getalldefines", "resolvedefines",
+           "math", "getwrittenblocks", "getmapper", "getsymbolsfile"]
+_target_api_ver = 303
+_asar = None
+
+
+class AsarArithmeticError(ArithmeticError):
+    pass
+
+
+class errordata(ctypes.Structure):
+    _fields_ = [("fullerrdata", c_char_p),
+                ("rawerrdata", c_char_p),
+                ("block", c_char_p),
+                ("filename", c_char_p),
+                ("line", c_int),
+                ("callerfilename", c_char_p),
+                ("callerline", c_int),
+                ("errid", c_int)]
+
+    def __repr__(self):
+        return "<asar error: {!r}>".format(self.fullerrdata.decode())
+
+
+# for internal use only. getalllabels() returns a dict.
+class _labeldata(ctypes.Structure):
+    _fields_ = [("name", c_char_p),
+                ("location", c_int)]
+
+
+# for internal use only. getalldefines() returns a dict.
+class _definedata(ctypes.Structure):
+    _fields_ = [("name", c_char_p),
+                ("contents", c_char_p)]
+
+
+class writtenblockdata(ctypes.Structure):
+    _fields_ = [("pcoffset", c_int),
+                ("snesoffset", c_int),
+                ("numbytes", c_int)]
+
+    def __repr__(self):
+        return "<written block ${:06x} 0x{:x} size:{}>".format(
+            self.snesoffset, self.pcoffset, self.numbytes)
+
+
+# internal use only. patch() accepts a dict.
+class _memoryfile(ctypes.Structure):
+    _fields_ = [("path", c_char_p),
+                ("buffer", c_char_p),
+                ("length", ctypes.c_size_t)]
+
+
+# internal use only. patch() accepts a dict.
+class _warnsetting(ctypes.Structure):
+    _fields_ = [("warnid", c_char_p),
+                ("enabled", ctypes.c_bool)]
+
+
+# For internal use only.
+class _patchparams(ctypes.Structure):
+    _fields_ = [("structsize", c_int),
+                ("patchloc", c_char_p),
+                ("romdata", c_char_p),
+                ("buflen", c_int),
+                ("romlen", c_int_ptr),
+                ("includepaths", POINTER(c_char_p)),
+                ("numincludepaths", c_int),
+                ("should_reset", ctypes.c_bool),
+                ("additional_defines", POINTER(_definedata)),
+                ("additional_define_count", c_int),
+                ("stdincludesfile", c_char_p),
+                ("stddefinesfile", c_char_p),
+                ("warning_settings", POINTER(_warnsetting)),
+                ("warning_setting_count", c_int),
+                ("memory_files", POINTER(_memoryfile)),
+                ("memory_file_count", c_int),
+                ("override_checksum_gen", ctypes.c_bool),
+                ("generate_checksum", ctypes.c_bool)]
+
+
+class mappertype(enum.Enum):
+    invalid_mapper = 0
+    lorom = 1
+    hirom = 2
+    sa1rom = 3
+    bigsa1rom = 4
+    sfxrom = 5
+    exlorom = 6
+    exhirom = 7
+    norom = 8
+
+
+def _getall(func):
+    """Helper that does the work common to all the getall* functions."""
+    count = c_int()
+    raw_errs = func(ctypes.byref(count))
+    errs = []
+    for i in range(count.value):
+        errs.append(raw_errs[i])
+    return errs
+
+
+class _AsarDLL:
+    def __init__(self, dllname):
+        dll = ctypes.CDLL(dllname)
+        self.dll = dll
+        self.funcs = {}
+        try:
+            # argument/return type setup
+            # (also verifies that those functions are exported from the DLL)
+            # this is directly from asardll.h
+            # setup_func(name, argtypes, returntype)
+            self.setup_func("version", (), c_int)
+            self.setup_func("apiversion", (), c_int)
+            self.setup_func("init", (), ctypes.c_bool)
+            self.setup_func("reset", (), ctypes.c_bool)
+            self.setup_func("patch", (c_char_p, c_char_p, c_int, c_int_ptr),
+                            ctypes.c_bool)
+            self.setup_func("patch_ex", (POINTER(_patchparams),), ctypes.c_bool)
+            self.setup_func("maxromsize", (), c_int)
+            self.setup_func("close", (), None)
+            self.setup_func("geterrors", (c_int_ptr,), POINTER(errordata))
+            self.setup_func("getwarnings", (c_int_ptr,), POINTER(errordata))
+            self.setup_func("getprints", (c_int_ptr,), POINTER(c_char_p))
+            self.setup_func("getalllabels", (c_int_ptr,), POINTER(_labeldata))
+            self.setup_func("getlabelval", (c_char_p,), c_int)
+            self.setup_func("getdefine", (c_char_p,), c_char_p)
+            self.setup_func("getalldefines", (c_int_ptr,), POINTER(_definedata))
+            self.setup_func("resolvedefines", (c_char_p, ctypes.c_bool),
+                            c_char_p)
+            self.setup_func("math", (c_char_p, POINTER(c_char_p)),
+                            ctypes.c_double)
+            self.setup_func("getwrittenblocks", (c_int_ptr,),
+                            POINTER(writtenblockdata))
+            self.setup_func("getmapper", (), c_int)
+            self.setup_func("getsymbolsfile", (c_char_p,), c_char_p)
+
+        except AttributeError:
+            raise OSError("Asar DLL is missing some functions")
+        api_ver = dll.asar_apiversion()
+        if api_ver < _target_api_ver or \
+                (api_ver // 100) > (_target_api_ver // 100):
+            raise OSError("Asar DLL version "+str(api_ver)+" unsupported")
+
+    def setup_func(self, name, argtypes, restype):
+        """Setup argument and return types for a function.
+
+        name: name of the function in the DLL. "asar_" is added automatically
+        argtypes and restype: see ctypes documentation
+        """
+        func = getattr(self.dll, "asar_" + name)
+        func.argtypes = argtypes
+        func.restype = restype
+
+
+def init(dll_path=None):
+    """Load the Asar DLL.
+
+    You must call this before calling any other Asar functions. Raises OSError
+    if there was something wrong with the DLL (not found, wrong version,
+    doesn't have all necessary functions).
+    You can pass a custom DLL path if you want. If you don't, some common names
+    for the asar dll are tried.
+    """
+    global _asar
+    if _asar is not None:
+        return
+
+    if dll_path is not None:
+        _asar = _AsarDLL(dll_path)
+    else:
+        if sys.platform == "win32":
+            libnames = ["./asar.dll", "asar", "./asar-x64.dll", "asar-x64"]
+        elif sys.platform == "darwin":
+            libnames = ["./libasar.dylib", "libasar"]
+        else:
+            libnames = ["./libasar.so", "libasar"]
+
+        for x in libnames:
+            try:
+                _asar = _AsarDLL(x)
+            except OSError:
+                continue
+                
+        if _asar is None:
+            # Nothing in the search path is valid
+            raise OSError("Could not find asar DLL")
+
+    if not _asar.dll.asar_init():
+        _asar = None
+        return False
+    else:
+        return True
+
+
+def close():
+    """Free all of Asar's structures and unload the module.
+
+    Only asar.init() may be called after calling this.
+    """
+    global _asar
+    if _asar is None:
+        return
+    _asar.dll.asar_close()
+    _asar = None
+
+
+def version():
+    """Return the version, in the format major*10000+minor*100+bugfix*1.
+
+    This means that 1.2.34 would be returned as 10234.
+    """
+    return _asar.dll.asar_version()
+
+
+def apiversion():
+    """Return the API version, in the format major*100+minor.
+
+    Minor is incremented on backwards compatible changes; major is incremented
+    on incompatible changes. Does not have any correlation with the Asar
+    version. It's not very useful directly, since asar.init() verifies this
+    automatically.
+    """
+    return _asar.dll.asar_apiversion()
+
+
+def reset():
+    """Clear out errors, warnings, printed statements and the file cache.
+
+    Not really useful, since asar.patch() already does this.
+    """
+    return _asar.dll.asar_reset()
+
+
+def patch(patch_name, rom_data, includepaths=[], should_reset=True,
+          additional_defines={}, std_include_file=None, std_define_file=None,
+          warning_overrides={}, memory_files={}, override_checksum=None):
+    """Applies a patch.
+
+    Returns (success, new_rom_data). If success is False you should call
+    geterrors() to see what went wrong. rom_data is assumed to be headerless.
+
+    If includepaths is specified, it lists additional include paths for asar
+    to search.
+
+    should_reset specifies whether asar should clear out all defines, labels,
+    etc from the last inserted file. Setting it to False will make Asar act
+    like the currently patched file was directly appended to the previous one.
+
+    additional_defines specifies extra defines to give to the patch
+    (similar to the -D option).
+
+    std_include_file and std_define_file specify files where to look for extra
+    include paths and defines, respectively.
+
+    warning_overrides is a dict of str (warning ID) -> bool. It overrides
+    enabling/disabling specific warnings.
+
+    memory_files is a dict of str (file name) -> bytes (file contents). It
+    specifies memory files to use.
+
+    override_checksum specifies whether to override checksum generation. True
+    forces Asar to update the ROM's checksum, False forces Asar to not update
+    it.
+    """
+    romlen = c_int(len(rom_data))
+    rom_ptr = ctypes.create_string_buffer(bytes(rom_data), maxromsize())
+    pp = _patchparams()
+    pp.structsize = ctypes.sizeof(_patchparams)
+    pp.patchloc = patch_name.encode()
+    pp.romdata = ctypes.cast(rom_ptr, c_char_p)
+    pp.buflen = maxromsize()
+    pp.romlen = ctypes.pointer(romlen)
+
+    # construct an array type of len(includepaths) elements and initialize
+    # it with elements from includepaths
+    pp.includepaths = (c_char_p*len(includepaths))(*includepaths)
+    pp.numincludepaths = len(includepaths)
+
+    defines = (_definedata * len(additional_defines))()
+    for i, (k, v) in enumerate(additional_defines.items()):
+        defines[i].name = k.encode()
+        defines[i].contents = v.encode()
+    pp.additional_defines = defines
+    pp.additional_define_count = len(additional_defines)
+
+    pp.should_reset = should_reset
+
+    pp.stdincludesfile = std_include_file.encode() if std_include_file else None
+    pp.stddefinesfile = std_define_file.encode() if std_define_file else None
+
+    warnsettings = (_warnsetting * len(warning_overrides))()
+    for i, (k, v) in enumerate(warning_overrides.items()):
+        warnsettings[i].warnid = k.encode()
+        warnsettings[i].enabled = v
+    pp.warning_settings = warnsettings
+    pp.warning_setting_count = len(warnsettings)
+
+    memoryfiles = (_memoryfile * len(memory_files))()
+    for i, (k, v) in enumerate(memory_files.items()):
+        memoryfiles[i].path = k.encode()
+        memoryfiles[i].buffer = v
+        memoryfiles[i].length = len(v)
+    pp.memory_files = memoryfiles
+    pp.memory_file_count = len(memory_files)
+
+    if override_checksum is not None:
+        pp.override_checksum_gen = True
+        pp.generate_checksum = override_checksum
+    else:
+        pp.override_checksum_gen = False
+        pp.generate_checksum = False
+
+    result = _asar.dll.asar_patch_ex(ctypes.byref(pp))
+    return result, rom_ptr.raw[:romlen.value]
+
+
+def maxromsize():
+    """Return the maximum possible size of the output ROM."""
+    return _asar.dll.asar_maxromsize()
+
+
+def geterrors():
+    """Get a list of all errors."""
+    return _getall(_asar.dll.asar_geterrors)
+
+
+def getwarnings():
+    """Get a list of all warnings."""
+    return _getall(_asar.dll.asar_getwarnings)
+
+
+def getprints():
+    """Get a list of all printed data."""
+    return [x.decode() for x in _getall(_asar.dll.asar_getprints)]
+
+
+def getalllabels():
+    """Get a dictionary of label name -> SNES address."""
+    labeldatas = _getall(_asar.dll.asar_getalllabels)
+    return {x.name.decode(): x.location for x in labeldatas}
+
+
+def getlabelval(name):
+    """Get the ROM location of one label. None means "not found"."""
+    val = _asar.dll.asar_getlabelval(name.encode())
+    return None if (val == -1) else val
+
+
+def getdefine(name):
+    """Get the value of a define."""
+    return _asar.dll.asar_getdefine(name.encode()).decode()
+
+
+def getalldefines():
+    """Get the names and values of all defines."""
+    definedatas = _getall(_asar.dll.asar_getalldefines)
+    return {x.name.decode(): x.contents.decode() for x in definedatas}
+
+
+def resolvedefines(data, learnnew):
+    """Parse all defines in the given data.
+
+    Returns the data with all defines evaluated.
+    learnnew controls whether it'll learn new defines in this string if it
+    finds any. Note that it may emit errors.
+    """
+    return _asar.dll.asar_resolvedefines(data, learnnew)
+
+
+def math(to_calculate):
+    """Parse a string containing math.
+
+    It automatically assumes global scope (no namespaces), and has access to
+    all functions and labels from the last call to asar.patch(). If there was
+    an error, ArithmeticError is raised with the message returned by Asar.
+    """
+    error = ctypes.c_char_p()
+    result = _asar.dll.asar_math(to_calculate.encode(), ctypes.byref(error))
+    if not bool(error):
+        # Null pointer, means no error
+        return result
+    else:
+        raise AsarArithmeticError(error.value.decode())
+
+
+def getwrittenblocks():
+    """Get a list of all the blocks written to the ROM."""
+    return _getall(_asar.dll.asar_getwrittenblocks)
+
+
+def getmapper():
+    """Get the ROM mapper currently used by Asar."""
+    return mappertype(_asar.dll.asar_getmapper())
+
+def getsymbolsfile(fmt="wla"):
+    """Generates the contents of a symbols file for in a specific format.
+
+    Returns the textual contents of the symbols file.
+    format specified the format of the symbols file that gets generated.
+    """
+    return _asar.dll.asar_getsymbolsfile(fmt.encode()).decode()
diff --git a/build.bat b/build.bat
deleted file mode 100644
index 996cccf..0000000
--- a/build.bat
+++ /dev/null
@@ -1,4 +0,0 @@
-del ..\working.sfc
-copy ..\alttp.sfc ..\working.sfc
-asar.exe LTTP_RND_GeneralBugfixes.asm ..\working.sfc
-@echo %cmdcmdline%|find /i """%~f0""">nul && cmd /k
diff --git a/build.sh b/build.sh
deleted file mode 100755
index fe7d050..0000000
--- a/build.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/bash
-
-rm ../working.sfc
-cp ../alttp.sfc ../working.sfc
-./xkas LTTP_RND_GeneralBugfixes.asm ../working.sfc