Hill Climb Rivals is an online mobile game, car racing game, head-to-head racing with hill climb style through green forest and sandy desert against opponent (AI) with different strength, is free to play on Android devices, from Magic Pixel KFT.
Download the game at:
https://play.google.com/store/apps/details?id=hu.magicpixel.HillClimbRivals&hl=en