Take your favourite tabletop game. Now imagine it is MEGA-sized. I'm talking the size of a room, or building. Are the pieces huge? Does it look like a giant Tsuro set?
Now imagine a tabletop game meant to be e played at that scale. How would it be different? What kinds of gameplay could happen at this scale that doesn't at a sit-around-a-table level? Let's call this "human-scale."
Mega-sized versions of tabletop games are one thing, but they have much the same feel, interactions and mechanics as the smaller version. In other words, it doesn't take advantage of being at Human scale.
Your challenge this May is to make a game at human-scale that takes as much advantage of it as possible. In essence, it is a game that could ONLY be played at human-scale.
On to the details!