If you have five spare minutes, Worm Crawl will fill them. Everything happens on one screen with a starting step of 200 ms that tightens as you eat, and the whole thing runs straight in the browser - no downloads, no sign-ups, no fuss.
Steering is the whole game: swipes on touch, arrow keys or WASD on desktop. The input queue accepts two turns ahead, which means a well-timed double turn can thread a gap that looks impossible at first glance.
Nothing here needs a tutorial or a wiki. Controls are one gesture, the goal is one sentence, and the difficulty comes from execution rather than homework. That is exactly what a browser game should be.
Grow the longest snake without touching walls or tail.
Worm Crawl is filed under Arkad Shelf, and the decision comes down to one tag set: arcade, survival, classic. Those three words are the whole reason it is not sitting somewhere else.
Difficulty sits at Easy and the player count at 1. Those two numbers decide more about whether you will enjoy it than the theme does.
The companion game to try afterwards is Snake Blitz: same family, different emphasis, and together they show what the Arkad Shelf is actually good at.