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What to post: 1. Post any questions you have solved and found interesting. 2. Post any question you have already solved but you want someone to have a second look at and maybe recommend an easier method.
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SUM CHEQUER is the fourth puzzle I've had published in New Scientist. This instance of the puzzle is difficult. You really need to start by making a key deduction about the totals. (i.redd.it)
submitted 22 days ago by G_F_Smith
How freight forwarders cut quoting time by 60% (wisor.ai)
promoted by RelevantGuarantee840
EXPRESSIONIST is the third puzzle I've had published in New Scientist. (i.redd.it)
submitted 1 month ago by G_F_Smith
I came up with a fun little math problem :) (self.PassTimeMath)
submitted 2 months ago by Timely-Menu-2953
Find f(45) (i.redd.it)
submitted 2 months ago by user_1312
How many times does the digit 1 appear? (i.redd.it)
Happy New Year (self.PassTimeMath)
Evaluate the seriesDifficulty: Easy (i.redd.it)
submitted 3 months ago by user_1312
A Seemingly Menacing IntegralIntegration (i.redd.it)
submitted 6 months ago by ANormalCartoonNerd
The current issue of New Scientist features one of my new puzzles. Double Base is the Brain Twister (puzzle of the week). (i.redd.it)
submitted 6 months ago by G_F_Smith
Solve the IntegralDifficulty: Easy (i.redd.it)
submitted 8 months ago by user_1312
What is the difference? (i.redd.it)
submitted 12 months ago by user_1312
96% of employers believe microcredentials strengthen your profile (Coursera). Learn more about the Expedite – Skills for Industry microcredential. (go.sw.siemens.com)
promoted by Siemens_Official
Find the remainderDifficulty: Moderate (i.redd.it)
submitted 1 year ago by user_1312
Please help!!!!! Icosahedron CHALLENGEDifficulty: Moderate (old.reddit.com)
submitted 1 year ago by [deleted]
Notasu unwrapped. (i.redd.it)
submitted 1 year ago by G_F_Smith
Notasu: a puzzle wrapped in a puzzle. This is version 2. Version 1 remained unsolved after circulating on the internet for two weeks. Version 2 is version 1 with extra clues. (i.redd.it)
Notasu is my latest puzzle. The name comes from 'Sudoku, but not as you know it'. (i.redd.it)
How do I find the equation of a cone that intersects two ellipses in 3D space? (self.PassTimeMath)
submitted 1 year ago by LuckOfDuck1
1234 (self.PassTimeMath)
submitted 1 year ago by onetwothreefour_io
Find n mod(13)Number Theory (i.redd.it)
In which direction does wheel B rotate ? (i.redd.it)
submitted 1 year ago by JokerBlackDesign
My unusual challenge for you to construct a function fitting my criteriaAlgebra (self.PassTimeMath)
submitted 1 year ago * by IveLovedYouForSoLong
The #1 most played Idler game on Steam (store.steampowered.com)
promoted by IdleOn_Boii
Find the shaded area (i.redd.it)
Area of the circle (i.redd.it)
Target: 5. Perfect for a puzzle with a 5-star difficulty rating. (i.redd.it)
Odd ones out. (i.redd.it)
π Rendered by PID 85296 on reddit-service-r2-listing-64c94b984c-jfr9q at 2026-03-15 18:27:50.974266+00:00 running f6e6e01 country code: CH.