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[Always-Free Friday] Simon Tatham's Portable Puzzle Collection
(www.chiark.greenend.org.uk)
This is a place to post limited-time giveaways of full video games that are then yours to keep forever at no cost (i.e. this is not for steam sales, free-to-play games, free weekends, competition giveaways, or free in-game items!)
Please don't repost stuff that's already been posted or stuff that breaks feddit.uk rules (i.e. don't be a dick!)
There are tons of great games in this collection. My favorite is probably Keen, which is a bit like Sudoku (also included) but with arithmetic constraints. Lately I've been solving a lot of Loop puzzles, where you trace a line around a grid (lots of types of grid available) while making sure certain cells have a specific number of adjacent lines.
I'm a big fan of Loop, I played the simple squares version in physical puzzle books back in the day but there are like 20 different shape combinations which make for a completely different puzzle