Hidden message
A friend send you a weird package containing only a piece of jewellery or something like that. Black and white cubes on a string. After failing with things like Morse code, you left it on a table and started to think what else you can try. After while you looked at it again and as you unconsciously started to rotate the very first cube, the other were rolled on and something like picture appeared ...
(image from http://pdpics.com/photo/2842-beads-out-of-bag/)
Take the string from file available in this repo (https://github.com/otaznik-net/roll_the_rocks/) and start rolling it around (clockwise) character by character to discover hidden message
e.g.
"123456789" =>
923
814
765
"523 641" =>
123
45
6
"a45b gf93 6c e82 d71" =>
123456
789abc
defg
Feel free to post PRs