well, we found a game named "the sandbox" searchit from the app store to achieve it. Here are some things that I want to tell you:
1. You have got a story mode with 30 levels and a free mode.
2. You have a moneykind thing called "mana" It is blue and you earn it each time you finish a mission.
3. The metal system works similar to the wire system we have.
4. In the last mission (30) you don't have to use wall you can use note block.
5. Achievements give you mana.
If you have any other questions you can ask me.
maybe it is but It is the only powdertoy-like game in ios devices
oh thanks for telling the other game
Im playing it right now,
its not like a sandbox game, its more of a doodlegod-like game
which level are you on and are you playing story mode or free mode?
I hate it when they try to force you to spend money -_-'
story mode, until I ran out of mana to buy elements
Its now going into my unused app folder