While The Sandbox is free, new aspects are unlocked with mana points, that are awarded as you play via missions or acquired by way of in-app purchases. Mana factors will also be utilised to purchase hints for notably tricky puzzles - Luckily for us the hints are not as well https://docs.google.com/spreadsheets/d/1Fxcd-ASAX_e7qkjvGwjetD8daPPkedGieUzCrZsUfOk/edit#gid=0