Zero Sum

Working

Find runs of numbers that add to zero before the sixty seconds run out

Runs in the browser1 checkGames and play

Open Zero SumChecked 2 days ago

What stands out

Taken from the page and the access facts we recorded. Nothing here is guessed.

practise quick mental arithmetic against a clock
play a short number puzzle between tasks
No account required
Free

What we checked

A missing tick means we have not measured it. A red mark is a check that failed.

App accessible
The last check reached a working page.
Page rendered
The last browser pass found a page that rendered.
Screenshot kept
We captured a picture of the page.

Looked: 0
Opened: 1
Checks: 1
Watching: 0

Looked and opened count distinct browsers on this site, not verified people. Checks are requests we made. None of these come from the app itself.

Screenshot of Zero Sum — Screenshot from our last capture

Evidence

Each bar is one request we made

Checks: 1
Working: 100%
Median response: 205ms
Watching since: 2 days ago

Browser render check

Checked 11 hours ago in a real browser

1 page rendered

Pages loaded in a real browser, not just an HTTP request. Route discovery is best-effort — nav links not in the initial DOM are not followed. How we check

Activity

Watching since 2 days ago

Last content change: None seen yet
Unchanged for: 2 days
Certificate expires: in 44 days

How it looked

2 days ago
11 hours ago

We hash the visible text on every check, so a redesign registers and a rotating advert does not. An app that has not changed in a long time is not necessarily abandoned — but it is a fact worth knowing before you depend on it.

What it does

A timed maths puzzle on a grid of numbers. Click a number to start a sequence and extend it through adjacent tiles, scoring when the sequence sums to zero — longer sequences are worth more. You have sixty seconds. There is a dark theme and a choice of click or drag highlighting, and the source is on GitHub.

What people say

No reviews yet.

We would rather show none than invent them.

Embed this status

Put it in your README. It updates itself every time we check, and links to your verification record — evidence a stranger can read, not a page selling them something.

[![Zero Sum — still works](https://itstillworks.cruscible.com/api/badge/zero-sum)](https://itstillworks.cruscible.com/verify/zero-sum)

Others like this

Each of these answered on its most recent check.