Monster Train will allow cross-play between 4 platforms

Monster Train
Release Date: May 21, 2020
Official Website: Link
Supported game modes:
  • Single player
  • Multiplayer
Supported player perspectives:
  • Bird view / Isometric
Crossplay platforms:
Monster Train will support cross-play across multiple platforms. It will be possible to play together with your friends on XBox Series S/X, XBox One, Nintendo Switch and Windows PC. Please check out all the details on the game's official website!
Cross-Platform Combination Details:
Source: Link
Additional Info: Yes, cross-play is enabled by default on all platforms. There is no cross-save between Steam & Xbox.
Summary:
Hell has frozen over. Only you can protect the final burning pyre from the forces of heaven and restore the inferno. Monster Train brings a new strategic layer to roguelike deckbuilding, with three vertical playing fields to defend. Includes the released updates Wild Mutations and Friends & Foes! No playthrough is ever the same, it’s a fresh challenge every time. You’ll never play the same deck twice!
Screenshots:
Image 1Image 2Image 3Image 4
Artworks:
Image 1
Supported game modes:
  • Single player
  • Multiplayer
Supported player perspectives:
  • Bird view / Isometric