Puzzles about the systems that run your day.
Each puzzle is a line. You write its rules and watch the day run.
Free · in the browser · desktop and phoneElevator
The lifts of an office tower · 20 levels · 1 to 4 cars- The First Day1–5
- Office Hours6–10
- The Growing Tower11–15
- The Skyscraper16–20
- The First Day1–5Start here
- Office Hours6–10Start here
- The Growing Tower11–15Start here
- The Skyscraper16–20Start here

Weekly building
The same building for every player. It changes on Monday at midnight.- No.
- 41
- Week
- 5 Oct – 11 Oct
- Line
- Elevator
- Changes in
- 5D 16H