My cousin showed me this fun game called osu! For those of you who don't know what osu is, it's basically this:
You find a song and you select the difficulty.
Then, hit the notes right and survive till the end of the song.
There is multiplayer so that's a plus.
On top of that, you can make your own beatmaps.
There are thousands of songs already that you can download, and since more can be made, it's infinite.
Finally, downloading and playing osu is free!

So yeah, I think this would be a cool thing to add to the Slap-Gaming website. If you say no, then please give a reason why.