Super Bomberman R Online is really, really, good. The new BATTLE 64 rules are well thought out and honestly the whole thing feels like the logical direction for the series to take with online multiplayer.
While it’s only available via streaming on Stadia for now, this sort of large player-count multiplayer online game is a great fit for the service, and Konami has improved the netcode considerably from Super Bomberman R. It’s significantly more responsive (and playable) than playing that game locally, despite it being streamed. The beefier CPUs in Google’s datacenters probably helped to reduce the input lag that was notorious in the last game on console - like that game this one is also on Unity engine, for better and worse.
When it comes to more platforms I hope it has cross-play.
Hopefully this trailer explains the rules a bit better than I managed: https://www.youtube.com/watch?v=Cc-8n0Ql-p4