New Magma Chamber / 1v1 Mode! The Showdown!

It is that time of year again, and Riot is coming out with a new mode this Christmas, and it is a 1v1 map! In this map you will go either 1 vs 1 or 2 vs 2 in the Howling Abyss. Unlike ARAM though, you win by either getting 100 cs before your opponent does, take down the opponent's turret before yours fall, or you either get first blood by killing your opponent first!

   
You may also take a trip to the fountain, recall, and shop whenever you want. Sounds simple enough right? But then there are restrictions on this map also. You may only have two doran items. So you can't stack six doran blades, so what? It's all good. I am actually very excited for this mode. I can't wait until my friends and I dish it out on the Howling Abyss, or maybe I'll team up with them and fight other duo laners!
Here is the official post posted by Riot:

EDIT: Due to the minion AI issue currently affecting all modes on PBE, Showdown has been temporarily disabled. We will get this back up as soon as the issue is resolved!
Hey everyone! The Showdown featured game mode, centered around 1v1 or 2v2 skirmishes on Howling Abyss, is now playable on PBE! Give it a shot and tell us what you think!
Rules are simple; you win if any of the following happen:
-In a 1v1, first blood wins! In 2v2, the first team to get two kills wins. Suicides count as kills (albeit uncredited).
-The first team to kill a tower wins the game.
-The first team to score a combined 100 CS wins the game.
Remember that unlike in ARAM, you are allowed to heal, shop, and recall to base whenever you want.
There are a couple of known issues with this build that should be addressed by tomorrow:
-The Showdown loading screen is WIP - champion frames might not fit properly on 2v2 during loading
-Doran's items have missing tooltips when viewed from the "Recommended Items" page
-Announcements for minion kill events have no VO and incomplete text
-Recall's tooltip on Showdown is missing
Let us know if you find any other bugs, and please feel free to leave lots of feedback about your Showdown experiences!