If you have five spare minutes, Hexa 4096 will fill them. Everything happens on one screen with a 6×6 board where the target tile is 4096, and the whole thing runs straight in the browser - no downloads, no sign-ups, no fuss.
The strategy sits in corner play: pick one corner, keep your biggest tile parked there, and never swipe it into the middle of traffic. With a 6×6 board where the target tile is 4096, the margin for error changes - more room means longer games, less room means every swipes counts twice.
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.
Merge equal tiles on a 6x6 grid and reach 4096.
There are 0 close relatives of Hexa 4096 in the catalogue, which is unusual here. Comparing it with the rest of the Teka Shelf takes about a minute and tells you more than any description.
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 practical advice: play it once with the sound off and once with it on. On this board the difference changes how you time your moves.