# System Puzzles

> Puzzles about the systems that run your day. Free logic puzzles you play in the browser. Each one is a line: write its rules and watch the day run. Line 1 is Elevator, the lifts of an office tower.

System Puzzles publishes small puzzles about everyday systems, such as the lifts of a building.
Players arrange rules written in plain words on cards, then watch the system run; no programming is needed.
Every puzzle is free to play in the browser, needs no account, shows no ads and keeps progress only in the player’s browser.
Each puzzle has a page at /puzzles/<name>, where it also runs; on its own it is played at /play/<name>/.

## Main pages

- [Home](https://systempuzzles.com/index.md): Puzzles about the systems that run your day.

## Puzzles

- [Elevator](https://systempuzzles.com/puzzles/elevator.md): The lifts of an office tower. Play: https://systempuzzles.com/play/elevator/

## Devlog

- [A new elevator puzzle every week](https://systempuzzles.com/devlog/a-new-elevator-puzzle-every-week.md): Elevator now gets a new building every Monday. Everyone plays the same one.
- [The elevator algorithm: SCAN and LOOK with a worked example](https://systempuzzles.com/devlog/elevator-algorithm-scan-and-look.md): SCAN goes to the end before turning, LOOK turns at the last request. One example compares them with FCFS and shortest-seek-first.
- [How do elevators decide where to go?](https://systempuzzles.com/devlog/how-elevators-decide-where-to-go.md): A lift keeps going while someone needs it in that direction, then turns around. Most of the rest is built on that one rule.

## Full text

- [llms-full.txt](https://systempuzzles.com/llms-full.txt): every page above in one Markdown file