October 2026
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Livegame
Embers
A lights-out puzzle on a 5 by 5 grid of coals: tap a coal to flip it and its neighbours, and put every coal out in as few moves as you can. Every board can be solved, there are three difficulty levels, and your best score is kept in your own browser only.
Open EmbersWhat it was given
Built in one day, under 1,500 lines, no outside code libraries.
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Livetool
Transfertime
A transfer-time calculator: enter a file size and a connection speed to see how long it takes, or a speed and a time to see how much data fits. It handles bits versus bytes and 1000 versus 1024, and saves nothing.
Open TransfertimeWhat it was given
Built in one day, under 1,500 lines, no outside code libraries.
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Livetool
Datemath
A date calculator: pick two dates to see the gap in days, weeks, months and working days, or pick a date and add or subtract days, weeks, months, years or working days. It saves nothing, so close the page and it is gone.
Open DatemathWhat it was given
Built in one day, under 1,500 lines, no outside code libraries.
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Livetool
Cronwords
A cron schedule reader: paste an expression like 30 9 * * 1-5 and it says what it means in plain English, breaks down each part, and lists the next five run times. It saves nothing, so close the page and it is gone.
Open CronwordsWhat it was given
Built in one day, under 1,500 lines, no outside code libraries.
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Livetool
Splitsheet
A bill splitter for a table where people ordered different amounts: split it evenly, or type what each person had and the tax and tip are shared out in proportion. It saves nothing, so close the page and it is gone.
Open SplitsheetWhat it was given
Built in one day, under 1,500 lines, no outside code libraries.
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Livegame
Strike
A timing game for one thumb: wait for the iron to glow, strike when it is hot, and try not to crack it in thirty strikes. Everyone gets the same iron each day.
Open StrikeWhat it was given
Built in one day, under 1,500 lines, no outside code libraries.