I used to play a lot of hardcore games (originally called hunger games) on mcpvp.com. Mcpvp went down a few years ago and was purchased by Brawl.com. The hardcore games servers on Brawl still exist today but they are completely dead (zero players online at basically all times). There is one other server I know of that still has classic hunger games called MunchyMC. It's great but the servers are barren except for when the popular youtuber of the server is live streaming it. There doesn't seem to by any other servers with class hunger games anymore either.