Sharpening those wits... I'm thinking sudoku, crosswords, riddles... do you like any brainy games like these?
I games and puzzles.
I get my share of puzzles on a daily basis as a software engineer:
I enjoy a brain teaser or other puzzle now and then, but usually my brain is pretty well burnt from work-related puzzles.
BTW, that is one of the reasons I love what I do!
Crosswords, Words with friends
NSA Crypto Challenge is my crack du jour.
Simon Shuker's code cracker is my favorite but I can only rarely find them.
Writing rhymed and metered poems is like a puzzle...kinda like a crossword--more freedom but also more work.