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blueprawn
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I made a javascript version of this game with circles (work in progress, unfinished):
https://fccm.github.io/Circle-Junction/circle-junction.html
https://github.com/fccm/Circle-Junction
A more refined version was written in Java:
Yes, it was short in time to make a better "game over" screen, so I just raised an exception.
In the next version, I would like to make the game log every attempts, logging which number was reached, and in how much time. So that we can see the progress, and you can compare your ability to succeed the test with friends.
The first day I was first exercising until 3 first, and then 5.
The second day I was able to reach 5 or 6 every time, and then after half an hour I'm sometimes able to reach the 9!
The mnemonic technique I'm using is that instead of memorising the positions of the numbers, I memorise the path from number 1 until 9. I memorise it as a kind of drawing/shape.
FLOSS: https://en.wikipedia.org/wiki/Free_and_open-source_software
I was thinking for exemple, why not modifying one of the Kenta Cho games and make a 64x64px version of it, it would probably be fun!
(As far as I know Kenta Cho games are rarely modified, usually only packaged as is, I for example packaged https://fr.wikipedia.org/wiki/Noiz2sa for Mageia)
I saw a modified version of Noiz2sa to use darker colors, or to port it to SDL2, I'm not aware of other derivative work of it.