The hub
Hub games, the maze and parkour
The compass in your hotbar or /servers picks a server. Teleports in the hub are instant: /spawn and warps don't make you stand still first, and finishing or leaving the maze, or losing a hub PvP fight, puts you at spawn at once.
Hub games
/boardgames (or /board) plays tic-tac-toe, connect four or BombSweeper. Click a checkers or tic-tac-toe board in the hub to take it, then someone else clicks it to play you.
The maze and parkour
A new maze every day: /maze start takes you to the start, stepping on the start block starts your timer (again, from zero, every time) and clicking the finish block ends it. /maze stats shows your best times. /parkour lists the parkour courses. Fall off and you're put back on your last checkpoint (the "Back to checkpoint" item or /parkour checkpoint does it too), standing on top of it even when it's a fence post, wall or iron bars.
In the maze and on a parkour course your hotbar is swapped for run items, and the lobby speed, double jump and launch pads are off until you're done; your own items come back after. In the maze the clock takes you back to the start (timer from zero) and the bed ("Quit maze", or /maze quit) takes you to spawn. On a course the plate takes you back to your last checkpoint, the clock restarts the course and the bed leaves it. The timer and your best time are on the action bar.
Quests
/quests shows the hub's own quests (parkour and the maze, hub PvP and King of the Ladder, board games) plus a daily pair. Network quests (the same on every server: play time, votes, the welcome story) are behind their own button, or /quests network. /shop opens the network shops (the token shop for cosmetics).