A unique puzzle for each second of the day, with lots of nice touches: the background fades between day and night based on London time, there's a satisfying bonnggg sound that shakes the game when you find a long word, fireworks if you clear the grid, etc. It also features a large dictionary and generously makes sure you don't get a Q without a U next to it.
Here's my NYT Spelling Bee inspired game, Spellbound. Besides coding it up, I created all the word lists. Compared to the NYT, there is more food and plants, fewer chemicals and fish, and no words that would embarrass anyone playing with their children. Free, no ads, no shared data, just for fun. And you don't need a subscription to the NYT to play it.