SPLIX (by Jespertheend). 47 minutes.
Splix is a multiplayer snake-plus-Qix-ish game. You join, and find yourself on a bounded board with maybe 80 or 100 other players. You move around like a snake (or rather, like a computer-game snake, which is to say at right angles and a regular speed, so very much not like a snake, in fact).
You have control of a certain territory on the board, shaded in the colour of your body to show that it's yours. Within that territory, you're safe, but when you leave it, your tail grows long behind you - until you rejoin your territory, at which point everything within the wide loop of your body becomes yours.
There are dangers. If you hit into your own body, you die. If you hit the edge of the playing field, you die. If you lose your connection, which sometimes happens, there's a good chance you'll die. But the main threat is from those 80 or 100 other players: if they hit your body while you're outside your own territory, trying to expand it or just exploring, then you die. Your game is over. You have only one life.
Until you die you have a score, which is: 500 points for every snake you've killed, and 1 point for every square of territory you currently control. This score is never constant - territory you control can be taken from you, eaten away one chunk at a time by people who swoop into your lovely green or yellow or pink field and claim it for their own. Even if they die, you don't get the territory back: it just fades to the unclaimed grey-brown background of the playing field. The only way to get your territory back is to surround it again with your long vulnerable body.
The safest tactic in this game is to take great and constant care - to grow your territory slowly; to flee from battle, relinquishing contested land; to never let your tail grow so far it extends off-screen, and to always stay close to your home so that you can dart back into it at a moment's notice. This works well, for a while. But sooner or later your score tops out: other players start eating away at your territory as fast as you can expand, and you stall in, perhaps, the lower registers of the high score board, eighth or tenth from the top.
Another option is to go on the attack. The 500 points you get for killing someone else? Those are 500 solid, worthy points that will stay with you until you inevitably die. Your territory can always be taken, and the points that go with it will vanish, but the points you get for successful attacks are for ever (for the rest of the game). This is a dangerous way to proceed and usually ends badly, but then, this is a game that always ends badly.
And yet another option is to expand your territory more boldly. You can go out into the world in a huge sweep, hoping that nobody will attack; or you can draw narrow stretches of claimed territory out into a huge square extending from your home, like the walls of a castle: if you manage to close that square then the massive central courtyard between your jagged buildings becomes yours.
These are all fine ways to play.
As you play Splix.io, you encounter other snakes using all of these different tactics. At first you know nothing about these snakes except their names, and perhaps an idea of the size of their territory (gathered from what you can see on the board plus the thumbnail of the entire playing space shown at the top of the screen).
Their name might be POOP; in fact their name is very often POOP. Their name might declare loyalty to, or disdain for, Donald Trump. Their name might say "plz dont kill me" or "i dont attack first" (ignore the claim: they do). Sometimes people manage to circumvent the content filters that I assume are in place, and find a way to be ingeniously racist (or, slightly more rarely, misogynist or homophobic). Dick, you may mutter to yourself under your breath.
Because beyond their name, and their territory, there's something else you quickly learn about nearby players: how much of a dick they are. Usually the answer is a bit of a dick, which is fine - you, too, are probably a bit of a dick while playing this game.
I certainly am. I would say, if asked, that I don't enter other people's territory unless they enter mine - but sometimes I make an exception, for example if a player is above me on the leader board, or I don't have any other practical options for expanding my territory, or I really want to. Plus I will almost always take an opportunity to kill an opposing player, should one arise, even if it's a player with whom I have previously maintained a cordial border - it's hard to deny the appeal of those 500 points.
Sometimes you find a player who is very clearly not a dick - they build their territory to the edge of yours and no further, a polite gap of one or two squares left between your lands, an implicit request for non-aggression (which I almost always honour and often make myself). Players at this extreme of "not a dick" will sometimes even refrain from killing opponents who have not yet attacked them. I feel warmly towards people who are entirely not a dick. Sometimes on a tour around the edge of my territory I will see that a player who was not a dick has died, leaving their territory empty, and I'm sad, though I also of course start to claim that empty space as my own.
Pn the other end of the scale, sometimes there's someone who is absolutely a dick, oh my god, such a dick. I've encountered players who claimed territory only from within mine - even when it would have been easier to stake out new ground. They were only interested in stealing from me, not in exploring for themselves. These people are dicks and I hate them and I want to destroy their snakes, and I do, maybe two times out of four, and another time someone else to whom they are also being a dick destroys them, and the fourth time they destroy me and I feel furious for at least a minute or maybe even two, how dare they, they were such a dick, where is the justice in that.
The justice is nowhere because there is no justice in Splix. You may start in an isolated corner with two walls of your territory protected and plenty of room to expand. You may start in the middle, surrounded by dicks. You may start mere squares away from an opponent who hits into your snake before you even have the time to absorb what's going on. You have to do the best you can with what you get, and sometimes the best you can do is nothing. Sometimes the situation is just too hard.
And when you win - well, there is no way to win in Splix; you can only balance uneasily on top of the leader board, always knowing you may be overtaken or simply eliminated. You are always just a moment of inattention or bad luck away from losing.
These are great truths of humanity, of course, articulated in art for many centuries. Nothing is fair, and trying hard is not always enough. The drive for revenge can destroy the best of us. Your frail body is the only home you have to live in, and you may rule an empire but everything still depends on that irreplaceable clumsy mustering of flesh. Sometimes, people are just dicks.
Plus you can play Splix without really paying attention to it while you're watching telly, so I don't know what more you might want from a game tbh.