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1. Play 15 Vs Matches on the Shadow Moses Island stage.

2. Play 130 Vs Matches

Snake is probably the second easiest character to unlock. You can earn Marth on the way to unlocking him as well. Just set the stock to 1 life, and play 15 Vs battles on Shadow Moses Island. Or, if you somehow manage to play 130 Vs matches without playing 15 of them on Shadow Moses Island, he will appear anyway. I'm not very familiar with him so I can't give much advice on defeating him. He looks like he has good projectile attacks, complimented by good close range skills. I will post more on him once I get a feel for his weaknesses.

We just battled Snake after our 15th brawl on Shadow Moses Island. My brother had to face him with Ike, who just couldn't keep up with his speed. After some bad luck, he got beaten by Snake. We played another match on Shadow Moses Island and got to fight him again... this time with King Dedede. MAKE SURE you have a character you are GOOD at when facing him. Our Dedede got beaten even worse than Ike. We decided to all play with characters that actually have a chance against him. This guy is Fast and strong. We finally finished him off with Pit after doing about 250 damage to him.