If you feel like Overwatch's current Free-for-all Deathmatch mode just isn't chaotic enough, I'm sure you'll be delighted to hear that Blizzard has now taken things a step further by adding Mystery Deathmatch. Much like the always-popular Mystery Heroes mode, the new Mystery Deathmatch operates under the same rules as the standard FFA Deathmatch, though instead of choosing a hero you are given one at random every time you die.
The concept is about as simple as it gets, so simple in fact that I'm surprised it took Blizzard this long to implement it, but don't take that as me trash-talking Mystery Heroes. Quite the contrary actually, I find it to be much more fun than the classic FFA Deathmatch mode where even a couple of people playing Brigitte, Roadhog and similar heroes can really put a damper on everyone's experience.
By the looks of things the Mystery Deathmatch will be on a weekly rotation like some of the other major side-attractions, so if you're up for a bit of a practice round and you don't particularly care which hero you play, I would definitely recommend you check it out while it's still available. But even if you aren't a fan of FFA Deathmatch, you still might want to play a round or two as your very first win will give you a free loot box.
That's pretty much everything you need to know, so just dive in there and have fun!