SNAKE GO
Snake Go is snake with a modern coat of paint. The rules you know: eat the food, your snake gets longer, don't run into the walls or your own tail. What's different is the look, the smoother movement, and a few extra items on the board that mix things up.
The difficulty comes from length. For the first minute it's easy to steer around a short snake. Once it's taking up a third of the board, every turn has to be planned a move or two ahead, and that's when it gets interesting. A high score here means you stayed calm when the board got tight.
It's a good fit for short sessions. A game lasts as long as you survive, which for most people is a couple of minutes, and starting another one is a single tap.
Arrow keys on a computer, swipe on a phone. No download, no account.