I understand that you'd like Spleef to return as a permanent game, but I'm afraid that won't happen. The playercount of Spleef, when it used to be a permanent game, was not that high. It often took a while for maps to fill up, which caused players to leave as they waited quite long for a game to start. The same goes for other removed games. Most of these removed games are now Featured Games and the community can vote on which game they would like to play for a few days! This can be done
here if you didn't know already.