(In all scenarios we would have Linkin Park, Evanescence, Papa Roach etc angsty music playing on speakers)
Anti-chess: first few to get checkmated get N. Limited supply only. Other "losers" get executed by an antique guillotine.
-alternatively
Medieval jousting, sword duels, gun duels, etc - set up an online stream on some Russian site. "Sanctioned Gladitorial Grounds." Matches start only after a donation threshold is reached, with an amount going to 'right to die groups'. Winners get N and an adult diaper. Attention would be huge due to millennials being edgy, pessimistic, and itching to watch taboo violence as an outlet for all of their stress. Also, winners would get a chunk of the donations that they can donate to their family.
-alternatively
10-30 years from now once 3-D printers are able to print out mobile SARCO machines, we get together and build an underground SARCOkart death circuit race. It would be programmed so that only the Top 3 would get instant N gassing, the other losers' machines kill their occupants through Iron Maiden method(spikes shooting into your body), over heating, suffocation, etc. One unlucky machine will play sound waves (from Linkin Park, Evanescence, Papa Roach etc songs) at increasingly higher decibel levels until they deafen the occupant, and eventually kills them as the decibel level reaches 200.
Same stream + prize money being sent to winners' families idea.