TETR.IO
tetr.io
Modern competitive stacking against real opponents
Mind Benders
Endless chess tactics drawn from real losing positions
lichess.org
A minute · Works anywhere
Free, no sign-up · online since 2013
Millions of tactical positions harvested from real games are served one at a time, rated against your own puzzle rating so difficulty tracks you. Themes can be filtered, so you can drill only forks, only endgames, or run Puzzle Storm against a three-minute clock.
Every position actually occurred in somebody's game, so the winning move is never an artificial construction, only a chance one player missed.
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Picked for a shared category and overlapping vibe, not for popularity.
tetr.io
Modern competitive stacking against real opponents
nytimes.com
One five-letter word a day, same word for everybody
play2048.co
Slide tiles, double numbers, lose an hour to one more go
nytimes.com
Sixteen words, four secret groups, four mistakes allowed
humanbenchmark.com
Measure your reaction time against millions of strangers
minesweeper.online
Minesweeper with leaderboards and no Windows required