With thousands of games running, it's impossible to find a friend's game. If they provide the 4 digit ID, there is no way to join that game directly.
We should be able to:
(a) search by the game ID, username, or host username, or
(b) jump to spectate the game directly (i.e. colonist.io/spectate/#xxxx)
If there's a ranking system, maybe it's possible to either:
1) Search by rank (highest to lowest ordering from top to bottom)
2) Filter based on elo-ranges