Conquer #1 runs limited class restrictions and no item restrictions. There are also no ELO stats.

Restrictions on Conquer #1 and #2 are:
-Soldier only on Spire.
-Pyro only available on Waste
-Engineer, Heavy, Spy not allowed on any map.

Conquer #3 is more lenient on restrictions, but:
-Soldier only on Spire.