Narbacular Drop is an environmental puzzle game in a fantasy setting, where the player navigates a dungeon with two interconnected portals. The dungeon has a series of traps and puzzles, which the player must solve by moving around objects in the environment using the portals. The key feature of this game is the Portal System. The game will be developed for the Windows 2000/XP PC. The game is non-violent and would receive an E for Everyone rating. The target audience is young casual gamers and hardcore gamers.