FREE: Sonic and All-Stars Racing Transformed [Steam Link]

The listing, Sonic and All-Stars Racing Transformed [Steam Link] has ended.

Sonic and the All-Stars cast line up on the starting grid once again to battle for supremacy in the ultimate race. Compete across land, water and air in incredible transforming vehicles that change from cars to boats to planes mid-race. It’s Not Just Racing. It’s Racing Transformed!
Key Features:

Play as over 20 legendary All-Stars each with their own transforming vehicle.
Race across 25 tracks and arenas.
World Tour, Grand Prix, Battle Arenas, and more.
Unleash ingenious weapons or utilise your character’s unique All-Star Move.
4 Player split screen and up to 10 player online events. Plus even take split screen gaming online.

More info: http://store.steampowered.com/app/212480/
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Link from humble bundle

This game includes steam trading cards

Good Luck!