Group by hub name, world name, channel, author, or whatever. On the group root item, show the number of games in the group, and total players.
Example:
- Seika 6 Games 24 Players Seika - Iccus... Iccusion PvP Se... 10 Players Seika - Iccus... Iccusion Semi-P... 5 Players Seika - Playe... Playe Semi-PvP ... 2 Players Seika - Playe... Playe Semi-PvP ... 1 Players Seika - Playe... Playe Semi-PvP ... 4 Players Seika - Playe... Playe Semi-PvP ... 2 Players + Castle 4 Games 18 Players Chatters Primary Server-... 7 Players
Chatters has no group since there is only one world instance advertised on the hub.