It uses WASD controls.
You hold W to go forward and turn with A and D. Jump+Drift with space. Mouse to aim your weapon (if applicable).

Racing
Finish the amount of laps before the others.

Sumo
Push the other guys off the stage. The stage will get smaller if it takes too long.

Soccer/Futball
Soccerball: Push the soccerball into enemy goal
Hockey: Soccer with a puck and the ground is slippery
Bowling: Soccer with a heavy ball
Basketball: Soccer but with baskets instead of goals.

Pachinko
Jump in and hope you fall in the middle to get most points.

All items are used by left click. Q click sometimes can be used as an alt fire (punching gloves behind you)

Boxing Gloves
It punches people.

Blue Ball
Defies gravity. Lifts people around you so they cant turn and stuff.

Tornado
Sends out a tornado to send enemy flying in the sky

Heart thingie
Chases you then blows up

There are fan-made levels and a level editor.

Here's a pack of them.
Copy and paste the contents into the assets folder (or read the readme.txt)
https://www.dropbox.com/sh/5r7hvn2nf9mtza3/IhFq4l_i6T URL does not work

Thanks to AWG for putting this together.

You play online. Dear lord.

Recommended: Disable Hamachi
Couldnt play with a friend over internet because it would try to connect via their hamachi IP instead

Dont know what hamachi is? then dont worry about it.