Zero Gear is multiplayer "mario kart" style , racing "combat" game with few minigames such as sport ,hopping and tag games and can be played only over your steam account and was made by Nimblebit

The game is hilarious to play with friends in "rainy days", best is real life friends or friends that live close to you since to play the multiplayer , you will need to create in-game server (nothing difficult, just few clicks) and if you live in America and have friends in Europe they will have lots of lag and the game will be most likely unplayable for them , so yea, real life friends or friends that live at same state or at least continent is really the best way to play this fun game. Also i would say that this game is really nothing for competitive freaks.
Why i'm saying play with friends? Well, it is always the best way to suck most fun from any game ,but right now, this game really lacks player base . It might be because the price for single copy is $19.99 and in my honest opinion, its way ,way too much for the content the game has right now. The $39.99 for four pack is still doubtable for lots of people, but i would say its ok prize ,however the game really needs some kind of free weekend and than $5 sale to get more players.
If you and your friends are not sure ,there is demo you can download and try out

Some videos of the game -
click race video
click race video
click race video
click race video
clikc race video
click hockey video
click basketball video
click hopping video