Answer 10 questions to climb from the 1st floor to the 11th. You get 15 seconds for each.
A wrong answer or running out of time drops you to Ground Floor. Then you try again.
The clock starts at your first question and never stops, retries included.
Accuracy: a green 10/10 means you never gave a wrong answer. If you did, the red number is the floor you first got wrong. Running out of time isn't a wrong answer.
Stats are saved on this device only.