Simply complete the base game (not extended) without pressing
at all. You're allowed to press it at the very start, when it tells you about the hints. But to play it safe, I'd just avoid the button completely. THIS INCLUDES DURING THE CREDITS.
If you, like me, hit the button during the credits trying to spam everything to skip them, don't panic! Just hit continue from the main menu, and when you complete the game again it should pop.