Read them in order: each Level, then its Challenge Book.
A fluorescent light in aisle twenty-nine starts to count. Three. Two. One. Ethan Vale is pulled into a trial with 7.8 million strangers, and on the first night he gives a girl the wrong answer. Solve it, or die.
The puzzles fold, mirror and turn. A wrong step on a rotating bridge is the last one you take. And at the end of the level, a message only Ethan can see: YOU HAVE BEEN NOTICED.

The three shapes were never decoration. They are an alphabet. On a list labelled RETAINED is a name Ethan never expected to see again: the girl from the grocery store. Not dead.

The trial becomes a vast cycling machine, and the grammar is cause and effect. Every choice echoes forward. Someone has to read time before the old engineer runs out of it.

Every wall has five layers and no one can read them alone. At the centre of the library is a door no one has ever opened, and the oldest question in the Codex: why are you reading? The finale.
