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There are actually two different glitch modes for this game, Extreme Mode is beatable, but Impossible Mode is impossible. I will explain them both.
Extreme Mode: Same steps as outlined, but the difficulty is set to "Normal"
Impossible Mode: Same steps, but you must set the difficulty to "Hard"
1. After completing Death Heim with the 38 lives password (or simply by inputting any Extreme Mode password and then resetting the game), then skip the demo and go to the title screen and change the difficulty from Normal to Hard. After selecting Hard difficulty, simply reset the game. Make sure you do NOT start the game after selecting the difficulty. Simply select it and reset. There will be a demo sequence where the Master dies in midair due to time running out. Then the game advances into the "Impossible Mode"
In Impossible Mode, you get 50 lives to start. The timer starts at 99, but goes down extremely fast. It goes down about 10 "game seconds" for every 1 second of real life. Also, the enemies in Extreme Mode that kill you instantly will do no damage, and the ones that did no damage will kill you instantly. The roles appear to have switched. You will die after approximately 10 seconds, making every level seemingly impossible to complete. Otherwise, Impossible Mode is exactly like Extreme Mode, insane amounts of HP and whatnot for different enemies.
No level (as far as I know) is doable in this mode. However, the password for this mode is simply...