Truxton/Hidden content
From Sega Retro
- Back to: Truxton.
View ending
When the "Push Start Button" text on the title screen is flashing, hold 
+
+
and press START .
Release , release , hold , release , hold , release , hold , hold , release , release , hold , release , hold , release .
Invincible
If you start the game after seeing the ending with the above command, you will be invincible[1].
References
