Black Hole Assault/Hidden content

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Invincibility

Enter "Name Entry" and register "MUTEKI" as a name, then use it in-game.

Visual test

Enter "Name Entry" and register names "VTEST0" through "VTEST5". Next, enter "Operation BHA" and select either of the names to play cutscenes tied to each name. Finishing or skipping the cutscene will return the player to the title screen.

Hidden credits

Enter "Name Entry" and register "?YUKES" as a name, then enter "Operation BHA" and select that name, then exit by clicking the button to the left of "NAME SELECT" and re-enter "Operation BHA" to display hidden credits in place of all registered names. These names can be used in-game if selected.