Do you still remember years back when we could play Minecraft in web browser without downloading files or anything? It had prebuilt and players were able to create servers in tabs and invite players.
The map was 128 x 128 x 128 and default game mode was just creative. This was an actual game called Minecraft classic and can still be played for free here: https://classic.minecraft.net/
For all nostalgics out there.. have fun!
PS: You don’t need Minecraft account, you don’t need to load or download any files or anything like that, not even port forwarding, just load up website and you can play – and you can also invite friends!