Hacker News Reader

Not strictly mathematical, and maybe not exactly 5 year old difficulty (some of these are HARD) but here goes:

https://www.chiark.greenend.org.uk/~sgtatham/puzzles/

There's an Android version of these puzzles and Linux packages (usually called "sgt-puzzles" or something similar). Apparently (I just found this out) they also work on the browser, which is pretty cool.

View on HN

I gave these to the high school kids that I mentor Robotics for - they each seemed to find different puzzles that they liked, so I consider that a win. These are the same kids who had fun learning binary search as a way to always win "high-low" guessing games, so they were already interested in logic.

My personal favorite from Tatham's puzzles is Net - I have it on my phone, with 15x15 wrapping being a nice way to relax and spend some time.

I have doodled away many hours on Net and Pearl :-)

Reply on news.ycombinator.com