Games and puzzles (online and offline)
Long time ago, before the internet, all the puzzles and games were offline (and many did not require more than pencil and paper, or chalk and a sidewalk, or a chess board, or absolutely nothing). Nowadays, as more and more games and puzzles are available online and a lot of providers are switching to a subscription or ad-funded model, maybe it's time to go back to the basics (i.e. offline)?