Wherigo

Wherigo is a platform that enables users to create and play GPS-enabled adventures in the real world. It provides tools for building interactive 'cartridges' that guide players to physical locations to interact with virtual objects and characters. Users can download these cartridges and play them on compatible GPS devices or Pocket PCs.

Wherigo is a platform for creating and playing GPS-enabled adventures, which aligns well with the concept of gamified travel. It allows users to select and play 'cartridges' (themed campaigns), which involve location-based challenges and navigation using GPS. While it doesn't explicitly mention a leaderboard or rewards system on the main pages, the core mechanics of themed, location-based, and interactive navigation are present.