Word Portal was created using Unity3D. The project started out as a tool for learning the new engine and wound up becoming a full-fledged game with cloud-based leader-boards and achievements, social media connectivity and ports on all major mobile platforms.
After beating the portal Nexus, you must get through the Underworld - level 4 - before you can get to Utopia. Level 4 consists of 10 rounds, each harder than the last.