Automatically scored dartboard where you can play darts with any throwable object in the game, including glowsticks, pencils, basketballs, chairs, microwaves, hand grenades and so on. You can even shoot at it with the flair gun (if you can see with all the lit flares around)
The best darts are the randomly found in-game objects such as books and flasks, since you can control the throwing force by holding Q/E. You can find them lying around inside the bases and other buildings. The smaller objects allow for more precise scoring, but anything goes. My personal favorites are mugs and bottles (yet getting score for smashing a TV into the dartboard has a nice feeling to it, too).
I don't own the S&D DLC, but I assume even artillery shells should work as long as they trigger the distance sensors (likely only once, though).
The scoring is designed for two players, for a common game of 301. Due to the complexity of shooting chairs and books, the rule about the last dart being bullseye or double is removed, you just need to get your score exactly to zero to win.
There's a button for resetting a game, and a keyboard if you want to start from different number than 301.
If it says "wait" for too long, it means the sensors are obstructed, remove the "darts" laying too close to the wall. Have fun!