Starcraft 2 Marine Arena

THIS IS MY TOP STRAT (I use this all the time with version 0.9.9 havent really played version 1.0.0 yet)

Game modes - Classic Marine Arena, Fast Mode, No Sudden Death

Strat - Immediately after the fast mode is selected choose the zergling mercenary then upgrade to get stimpacks with your command center and upgrade the speed upgrade for your zerglings.

Scan one section of the map to see what your opponents have and have your teammate scan another base, avoid people with zealots and zerglings

Once you find your target and you have at least 40 units total go in for an attack. Most of the time people are going to be attacking that huge rock that says destroy me. If you can get in there and wipe them up at this point its going to put you in the lead quick.

If you are lucky the person you are up against is an idiot and you and your teammate can over take and destroy your first two victims. If you can do this in under 10 minutes you pretty much win. You will have more kills than everyone and with the additional 300 minerals per command center taken out you will be in the lead very quickly

One of the most important upgrades I can recommend is the zergling upgrade in the middle that enchances your damage to armored units and structures. I always get two upgrades of that and I can usually sneak into bases and take out their mercenary buildings very quickly.

After that it's pretty much just pick your way to win people usually level up your marines for some endgame devastation. I like to mix it up but I always start with the zergling rush.