Life & fun · alternatives · 2026
24 alternatives to I wrote an explorer for the Singapore Olympiad problem
This interactive tool helps users explore the Singapore Mathematical Olympiad's viral birthday logic puzzle. It allows visitors to select potential dates for Cheryl's birthday and then trace through the logical… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. I wrote an explorer for the Singapore Olympiad problem launched in 2015; newer entries below may have overtaken it.
- 1IM
This is the first iteration of a short game I’m making that tries to interactively explain some of my favorite math questions / ideas. My goal is mostly to get the player curious and not necessarily to explain absolutely everything. There were a lot of fun technical parts to building this: - For implementation reasons, it’s much easier if the lines all have integer intersection points with each other. To do this, when a new line is added I “cheat” by rounding intersections to integers and then splitting the old lines at the intersection into new linds (with potentially different slopes)…
2024 · rahulilango.com · its alternatives →
- 2
Puzzle Lair brings Sudoku, Killer Sudoku, Calcudoku, X-Sudoku, Kakuro, Ripple Effect, Crossmath and Nonogram together in one clean, free site. Solve daily logic puzzles, track your stats and climb the leaderboards.
Jun 2026 · puzzlelair.com · its alternatives →
- 3
Hey there! I'm the brains behind the math crossword game on my site. This game is all about making math a little more fun – users just drag and drop numbers to fill in the blanks and move on to the next level if they get it right. Let me know if face any issues or have any suggestions! :)
2024 · scientific.place · its alternatives →
- 4
Hey, maker here. After launching a daily word search game, I randomly thought of this math game while driving. Finally got around to making it and I think it turned out pretty cool. It’s a math search game that’s meant to help you practice your quick addition, subtraction, multiplication, and division skills. I’m hoping it’ll help people (even those like me who aren’t big on math) learn and increase their speeds. (There are also some settings you can enable to make the game harder) If you try it out, please let me know if you found it fun, if you have anything you’d like me to add, or if you…
2024 · worchle.com · its alternatives →
- 5
Ithy AI▲167This is another one of my automate-my-life projects - I'm constantly asking the same question to different AIs since there's always the hope of getting a better answer somewhere else. Maybe ChatGPT's answer is too short, so I ask Perplexity. But I realize that's hallucinated, so I try Gemini. That answer sounds right, but I cross-reference with Claude just to make sure. This doesn't really apply to math/coding (where o1 or Gemini can probably one-shot an excellent response), but more to online search, where information is more fluid and there's no "right" search engine + text…
2025 · ithy.com · its alternatives →
- 6AD
2025 · rvlabs.ca · its alternatives →
- 7
- 8
I’ve been building a few small games to help kids (and curious adults) build reasoning and logic skills. Think Word Ladder, Prime Hunter, Math Maze ,all in the browser, no installs. Would love feedback or suggestions for new types of puzzles
2025 · quizmathgenius.com · its alternatives →
- 9
I've been playing with this for quite some time and I think it's finally ready for public consumption. All feedback welcome.
2025 · madmonk13.github.io · its alternatives →
- 10
Ever heard of the Tetris effect? It’s where you play so much Tetris that the game starts to seep into your thoughts, your dreams, your half-waking hallucinations, and pretty much every part of your reality that has nothing to do with Tetris. Well, I do a lot of crosswords—by “do” I mean both “solve”
2024 · aaronson.org · its alternatives →
- 11
Logic Traces▲59If puzzles are your thing, then Logic Traces is your game!
2016 · apps.apple.com · its alternatives →
- 12
- 13MC
2018 · mazebattles.com · its alternatives →
- 14
Make equations, gather points, have fun, improve math skills
2021 · grafing.hr · its alternatives →
- 15
- 16
- 17
Mathly▲68Solve math and science problems with AI, learn better
2023 · mathly.webflow.io · its alternatives →
- 18IB
Hi, I built Equatile, a logic-based puzzle game where you arrange number tiles on a grid to make every row and column equal their target values. It's built using Expo and is available for free on iOS, Android, and the Web. It's a game I've had in mind for almost 10 years now but never got to actually develop, until I came across Expo which made the process incredibly easy. I might open source the code on GitHub. I hope you enjoy playing it!
2025 · equatile.com · its alternatives →
- 19
We were genuinely impressed by Yann LeCun’s recent announcement about his Sudoku solver based on Energy-Based Models here: https://logicalintelligence.com/yann-lecun So we (a software engineer and prodigy mathematician) worked in the weekend to see if we can beat it and we did! If Kona solves puzzles in 313 milliseconds, we currently solve 270,000 puzzles per second! We do not know the internal mechanics behind Logical Intelligence’s system, but we are happy to share ours in the webpage there is a full description, code and also a paper published. Why people are obsessed with…
Feb 2026 · davisgeometric.com · its alternatives →
- 20
Hi all, I've always been fascinated by logic puzzles and, over the past 15 years, I've published around 300 zebra puzzles, mostly in Portuguese. Now, using LLMs, I've managed to automate the creation of these puzzles, leading to the birth of ZebraPuzzles.com. There are around 80 different themes that the generator uses to transform a raw puzzle into a thematic one. For instance, the LLM translates this clue: >The girl Shirt=Pink is next to the girl Age=11 to >The girl who wears a Pink shirt is next to the 11-year-old girl. The website offers five new logic puzzles daily, designed to…
2024 · zebrapuzzles.com · its alternatives →
- 21
- 22
Interesting to see that the entrepreneurs from more recent years tend to be doing well relative to years prior. Some interesting future directions could be: - Expanding search to be global and include more competitions, like biology and chemistry - Improving search so less unknown results - Showing insights, like trends over the years Kudos to Perplexity Computer for making this
Apr 2026 · perplexity.ai · its alternatives →
- 23MN
Hey folks, wanted to share my new logic game I created. I hope you'll enjoy it. It looks easy, but it's only illusion. The goal is to make 210 points on all levels: easy - doable, medium - not sure, hard - I'm happy when I make over 80...
2024 · make210.com · its alternatives →
- 24WM
Hi HN! We’re Devin and Aki. We made Pegasus to explore ideas on how to make learning more engaging. We were inspired by our own experience as students – we grew up being bored or disinterested with school, but found that friendly competition through our school’s math and science team was a great motivator for learning. Every day at midnight (PST), a new problem is released on pegasus.fm. As the first of many experiments we’re planning, we’d love to hear your feedback!
2023 · pegasus.fm · its alternatives →
Also compare
- I made a puzzle game that gently introduces my favorite math mysteries alternatives
- Got sick of ads, so I made my own logic puzzle site alternatives
- I made an interactive math crossword puzzle with infinite levels alternatives
- I made a web game that makes practicing basic arithmetic fun alternatives
- Ithy AI alternatives
- A difficult game to test your logic alternatives
Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →