Grid of Shadows - How to Play and Backstory

About Grid Of Shadows, from BoardGameGeek:

You are a group of wanderers who have entered the Grid of Shadows, a mysterious and enchanted realm where bluffing, sabotage, and deception rule. To escape this treacherous grid you take turns placing cards face-down on a shared grid, boldly declaring what they've played… or bluffing through their teeth. Some tell the truth. Others don't. The only certainty? Sooner or later, someone will call "Lights!" - forcing a dramatic reveal that could punish the bluffer or backfire on the accuser. Every card carries a unique ability. Some abilities activate if you're the first to play to a pile, others if you're the last - timing is critical. When the draw pile is empty, the game ends, and players total the value of the cards left in their hands. -description from the publisher