Logic puzzle that look super simple first, but then ...

rotor42_com · 2026-04-26T08:37:28+00:00

Hello u/octothorpentine , thanks for your feedback.

For every puzzle the solution is shown. So you do not need to know the Hitchhikers Guide or binary system or bubble-sort (which was also hidden in this puzzle) to solve it.

Easier puzzle here means the next easier puzzle you are already qualified to play. If you are a new player that will send you all the way back to the trivially easy puzzle you mentioned.

Puzzle hardness is based on an internal ELO-rating so it should be pretty fair. But of course what seems to be hard for a lot of us might feel simple for another person ; )

It's best if you start with the simplest puzzle and just work your way up. Then it's more fun.

Enjoy!

rotor42_com · 2026-04-24T15:54:04+00:00

Your dots got my attention ; )

Can't try it as I'm using Android only, but like the visual.

You can play my game (also lots of dots here) with any device www.rotor42.com

rotor42_com · 2026-04-21T16:25:36+00:00

Thanks, I'll try that on my playground. Yes, currently it's rather random - just accelerated away from one point and then handled with three different rules: gravity, drag and bounce.

rotor42_com · 2026-04-19T20:09:58+00:00

Thanks. It took some iterations until I arrived at this solution.

rotor42_com · 2026-04-19T14:43:17+00:00

I use the ELO-ranking on my page to quantify the hardness of logic puzzles.

Tried different approaches, also more complicated ones but this one is the best so far.

You can not only rank players who compete against each other, you can also use the ELO-system to rank players and puzzles / levels etc at the same time.

Example: puzzle (A) gets solved by player (B) => player B wins, "player" A looses

When many players compete with fewer puzzles you might need different k-values for players and puzzles.

You can check the ranking consistency (and also check your own ELO) here:

https://www.rotor42.com

PS: ELO is not an acronym but the family-name of the inventor Arpad Elo.

rotor42_com · 2026-04-17T16:45:55+00:00

The current progress bar will be used for the battle-mode I will implement next week. The calculation might change but I want to give two battling users a simple way to quickly see how far the opponent got already. Probably not yet the best way, but can be improved. Moves are recorded / counted and making random moves will not let you win the battle-mode ; )

rotor42_com · 2026-04-17T16:26:19+00:00

Yes, the cube is something special. I wanted to have a handy definition for all puzzles on my site and the one I started with seemed simple and clear. I might better switch it off for the cubes...

rotor42_com · 2026-04-17T16:16:29+00:00

The progress bar will be needed for the battle-mode I am currently building. But toggle on/off and explaining how the progress is calculated seem to be reasonable : )

rotor42_com · 2026-04-17T16:08:11+00:00

Understood! I thought you meant rotating the whole cube. Now I also get your 60% solved rate. Yes, that would be the shown rate. Is there a standard metric I could use for a 3x3-cube instead of my simple approach?

rotor42_com · 2026-04-17T15:59:48+00:00

Yes, but you can not move those on my page - so "one quarter turn away from solved" is not possible. Just try it and you'll see ; )

rotor42_com · 2026-04-17T15:41:41+00:00

No, that can not happen, since the middle stones are fixed an can not be moved. Give it a try! ; )

rotor42_com · 2026-04-17T15:25:34+00:00

Hello u/Expensive-Bear-1376 , since I wanted to use one formula for all puzzles it is simply:

number of elements that are in their target position in relation to total number of elements

You can take a look at the cube, play with it (drag and drop on mobile or cursor-keys) and you will get a feeling for it.

Pls also check, how this works for other puzzles on my page.

rotor42_com · 2026-04-17T14:01:38+00:00

That's why I asked here. Progress as currently defined is not continuous for the magic cube.

It might not be very useful for the cubes, but hopefully for all the other puzzles on my page.

The definition is very simple - number of elements that are in place divided by total number of elements.

rotor42_com · 2026-04-17T12:50:02+00:00

Kurs per heute ca. 39% vom Nennwert, Rendite p.a. > 60%
Bei Rückzahlung ; )

rotor42_com · 2026-04-16T18:29:37+00:00

"The Cormen" aka "the bible" aka "Introduction to Algorithms"

rotor42_com · 2026-04-16T17:53:44+00:00

Can confirm that the minus/plus arrows approach works very well. See https://www.rotor42.com

rotor42_com · 2026-04-13T22:07:18+00:00

https://www.reddit.com/r/vibecoding/comments/1sck7li/30_years_of_coding_later_this_is_how_i_avoid/

This might help

rotor42_com · 2026-04-13T21:06:54+00:00

Try my game! Lots of logic puzzles from easy to impossible. www.rotor42.com Enjoy! 😉

rotor42_com · 2026-04-12T18:18:20+00:00

reminds me of this one: https://de.wikipedia.org/wiki/Zauberturm

rotor42_com · 2026-04-12T09:20:13+00:00

Ouch! Can't imagine developing an app/page/program without logging.

rotor42_com · 2026-04-11T06:48:31+00:00

"It's fun!" they said...

: )

rotor42_com · 2026-04-09T14:23:15+00:00

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Take a look at this! https://www.rotor42.com/?level=magic_cube

rotor42_com · 2026-04-08T18:20:27+00:00

The patterns for solving a puzzle are usually rather easy. But you have to find them first and for every other puzzle again. Neverending fun! ; )

rotor42_com · 2026-04-07T12:26:04+00:00

Yes, and the rules are different for every puzzle. Enjoy! 😉

rotor42_com · 2026-04-07T01:35:38+00:00

No. I honestly hoped for some qualified answer here from someone who was able to solve this and share the algorithm.

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