Insector X (Arcade)

Round Select
Hold the service coin button (MAME default 9), then do a soft reset (MAME default F3). Once SERVICE SW ERROR shows up, let go of the service coin button and press P1 insert coin, P1 insert coin, P1 insert coin, service coin, P1 insert coin (MAME defaults 1, 1, 1, 9, 1). You will be taken to a round select. (This is the same code used in The NewZealand Story and is documented in MAME's driver source code. It is also used in Chuuka Taisen, only The New Zealand Story was known to have this code.) The code works in all versions of the game.