Riddle of the day

What it does

One riddle a day, with hints, free-form answer checking, explanations, streaks, and spoiler-free challenge links. No account, no ads, no feed, no algorithm — just a small daily thinking habit you can send to a friend.

Solve one carefully chosen logic puzzle every day, with hints, open-answer checking, full explanations, streaks, and spoiler-free challenges.

You have two unmarked jugs: one with 3 liters and one with 5 liters. You have a tap with unlimited water. How can you measure exactly 4from acertijodeldia.com

• IM
  I made a simple daily word puzzle2024 · triword.net · ▲114
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  Riddle Quiz－Trivia Logic Fun2023 · apps.apple.com · ▲76

  Test your IQ, brain, knowledge

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  Riddle Today2024 · riddle.today · ▲5

  Can you guess the riddle today?

• AN
  A new daily word puzzle2022 · twentyletters.com · ▲52
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  ClueDayJul 2026 · clueday.com · ▲8

  A free daily clue-based word puzzle game.

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  Riddle Website2024 · ▲5

  Daily puzzles

• 
  SimCity, but with Permits▲930

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 2d ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 14d ago · tanzaniaeducationproject.org

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  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 15d ago · bigwords.page

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  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 9d ago · guitoro.com

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  See *almost* any carriers phone settings▲432

  Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.

  Life & fun · 13d ago · carrierexplode.com

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  The whole Solar System and every tracked satellite, live in the browser▲407

  Life & fun · 23d ago · space.bl2.net

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  Fundraisly▲1,537

  AI fundraising agent that finds investors and books meetings

  AI · Jun 2026 · fundraisly.com

• 
  Homebrew 6.0.0▲1,481

  Today, I’m proud to announce Homebrew 6.0.0. The most significant changes since 5.1.0 are a new tap trust security mechanism, the new faster, smaller, default internal Homebrew JSON API, sandboxing on Linux, better defaults informed by our user survey, many brew bundle improvements, improved performance and initial support for macOS 27 (Golden Gate). Happy to discuss any questions here!

  Dev tools · Jun 2026 · brew.sh

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  Performative-UI – A react component library of design tropes▲1,181

  Hi HN! I was super frustrated at apps like tiktok and wechat preventing me from saving or downloading the animated gifs, so I made a little tool to turn a screen recording into a slack-sized emoji. Hope you get some value from this!

  Life & fun · Jun 2026 · vorpus.github.io

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  Upstream▲976

  The inbox designed for humans and agents

  AI · Jun 2026 · upstream.do

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  Goldfish▲958

  Press Option. It knows your work and replies like you

  AI · Jun 2026 · goldfish.sh

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  I made Google Trends for Hacker News by indexing 18 years of comments▲822

  Search 18 years of Hacker News and chart how any topic, tool, or person trended. Overlay terms to compare their rise and fall across 45M posts and comments.

  Life & fun · Jun 2026 · hackernewstrends.com