Forty years ago, Arctic Adventure was released for the TRS-80 with bugs that made it unwinnable. Now, the bugs have been fixed and you can play it in your browser.
Hearttreasure
Heartreasure 1 and Heartreasure 2: Underground are a pair of free, browser-playable (also mac/windows downloadable if that’s your preference) where’s waldo type games by nettaigyo.