http://nintendoeverything.com/tezuka-on-why-super-mario-maker-doesnt-have-all-content-unlocked-right-away/
In the latest issue of EDGE, Nintendo producer Takashi Tezuka spoke about Super Mario Maker’s unlock system. He told the magazine:
“This decision was part of our basic policy. We wanted the rewards to increase as you became more familiar with the game and to look forward to what would unlock the next day,” he says. “From our testing, we learned that if too much was available all at once then many players weren’t sure what they should do and didn’t have as much fun with the game. However, I do understand the feeling of wanting to unlock things earlier.”
Do you agree with him?