All gameplay content including tracks can be played for free. All microtransactions have to do with cosmetic items.
*KartRider: Drift has a fair F2P model in that there are no pay-to-win (P2W) items to purchase.
It has been confirmed KartRider: Drift will have cross-platform and cross-play functionality across all platforms. Speed racing which requires the player to drift to gain boost items. The game offers a variety of game modes, primarily based around item races using power-ups (comparable to Mario Kart). Arcade thrills, fast skilled competition, & deep kart + character customization awaits you on the track. It is a sequel to popular racer Crazyracing KartRider, released in 2004. KartRider: Drift is a free-to-play* multiplayer online racing game by Nexon for PC (Windows), Mobile (iOS/Android), Xbox One (soon) and PlayStation 4 (soon), similar to Mario Kart.