If you don't know what this game is, well its a minigame for both new super Mario bros for the ds and Mario 64 ds. Is there any way to get this game on speedrun.com if so please tell me and if you are interested tell me too.
If it’s a minigame that’s a part of another game it’s highly unlikely it’ll be added as a separate game on the site. You can check the LBs for the game(s) that include that minigame and see if they have it as an IL or a misc. category (assuming it has enough content to warrant being tracked at all).
You can also complete a run of it and pitch the idea to the community for those games and see if they’d be willing to add it as a misc category to the LB. But, don’t be surprised if the mods won’t add it because unless the minigame has decent content it may not get enough interest among the players of the game.
I see you already commented on this in the game’s forum. That’s a better place to ask for it.