Freeze!, an app from indie developer Andreas von Lepel and FrozenGunGames, is a great physics-based game known for its gorgeous visual appearance. The game's mechanics and gameplay style set it apart from the majority of iOS games, and its visuals are delightfully grayscale and creepy. But the app has received many content updates since it was first released, and now another world is available for your puzzle solving pleasure.
The latest update to Freeze! brings the game's fourth world, which packs many new fun and beautiful-looking levels and challenges. But this update also brings a new in-app purchase. While previously available in-app purchases have allowed players to unlock each world (1-4) for $0.99 each, the game's latest update adds the option for players to unlock all worlds (2, 3, and 4) for the same price: $0.99.
You can get Freeze! on the App Store for free.