Nintendo Spent A Year Working On What Essentially Sounds Like Zelda Maker
Briefly

"We were exploring a few different ways to play the game in parallel. In one approach, Link could copy and paste various objects, such as doors and candlesticks, to create original dungeons. During this exploration phase, this idea was called an 'edit dungeon' because players could create their own Legend of Zelda gameplay."
"As I played, I started thinking that while it's fun to create your own dungeon and let other people play it, it's also not so bad to place items that can be copied and pasted in the game field, and create gameplay where they can be used to fight enemies. That was the beginning of gameplay using 'echoes.'"
Read at Kotaku
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