How to setup the survival challenge:
1) Click multiplayer.
2) Click direct ip connection.
3) Click new game.
4) Close all but 2 slots (1 for you and 1 for AI)
5) *IMPORTANT* Set your difficulty to deity.
6) Make yourself Brismack!
7) Make your enemy Montezuma!
8) Make the map Great Plains.
9) Make the size duel.
10) Make it so the only way to win is conquest.
11) Turn these features on:
Raging Barbarians.
1 city challenge.
Aggressive AI
Always war
12) Start
13) If you beat the score to beat edit it in.

SCORE TO BEAT:
Kill him yourself in 5 turns.
-Phantomtable