You've discovered how to get 1 million coins and we've told you where to find the trickiest Star Coins and now, for our final New Super Mario Bros 2 guide, we're telling you how to reach all the hidden exits. Armed with these three guides, you should have no problem reaching gold standard.
Mind The Door
Visit the World 1 tower and play through it as normal. Shortly after the half-way flag you'll find this door. You don't need to be an expert on doors to figure out that it might be a good idea to head inside this one, so do it. Don't worry about power-ups or anything like that, though: you won't need any for this particular secret exit.
Go Right Ahead
Once you go through the door you'll be presented with this bonus room featuring a roulette coin block. The obvious thing to do here is hit the coin block, then go through the door to return to the level. Instead, wait until the green blocks move and walk through the gap on the right when it opens up. Then keep walking out of the screen.
This takes you to a secret room with a yellow pipe, which leads you to the roof of the tower and a secret flagpole. This unlocks the World 1 Cannon, which is a tricky level where Mario constantly runs and you have to time his jumps properly. Limber up those fingers and finish the level to unlock the special Mushroom World.