Flagpole Fireworks for New Super Mario Bros. U on Wii U (WiiU)
Getting a nice fireworks show after finishing a level at the flagpole may seem random, but there's actually a way to get them every time. You must time your jump so that you land on the pole with the last two digits left on your counter matching (11, 22, 33, etc.). The number of fireworks you get is also dependant on these two digits. The higher the number, the more fireworks you'll get. So aim for a 99 on the counter to get a great fireworks show every time, that draws a fitting end to your triumph.
5 Star Save File
The ultimate achievement in the game is to get 5 Stars beside your save file, and you'll need to accomplish numerous things to unlock this. Firstly, be aware that you can never use an Assist Block 9the green guide blocks) to help you, or you will forever be unable to reach 5 Stars. Here are the other tasks you'll need to accomplish to unlock it:
Getting a 5 star save file will grant you unlimited Toad Houses.