How to unlock Ragnarok for Multi Player Mode:
Finish the game one time to unlock him for local play in multi player
Get New Mechs:
To get new mechs all you have to do is beat game on campaign mode. More mechs are as follows...
Easy: 2 new mechs.
Medium:1 more new mech.
Hard:1 more new mech.
Difficult:2 more mechs.
You get Ymir the same way as getting Ragnarok,by beating the entire game. Ymir has different weapon choices that some may prefer in battle.
Beat "Size Matters" Easily:
If you've made it to Size Maters, the second part, you know that at the end, there are about 9 or 10 mechs. If you try to fight them, kill the one in the middle so that it kills the others in the explosion. If you want to beat the mission, run past them to the mansion. Put a chaff on it to attract the missiles, the start shooting. Try to get other mechs by it so it hurts them when it falls. Otherwise, choose to make the helicopters crash on the mechs. Hopefully you make it.
Instant Enemy Deaths:
This code instantly destroys your enemy, as long as they are in the right place. Wht you do is:
1. Make sure that your enemy is under, or RIGHT, IMMEDIATELY NEXT TO a bridge, or a building.
2.Use your weapons, cycling thruogh them, to shoot, bomb, or just DESTROY the bridge/building.
3.If your enemy was under or close enough to the now blown-up structure, than the enemy mech will blow up, and be dead.
*This works for YOU, too. If you are on/near/under the structure when it is destroyed, you will be... gone.
**If you are in multiplayer Grinder, this works, also.
***You can also weaken bridges beforehand, too. If you shoot the bridge enough, it will smoke, first at the far end, then middle, then close to you. Once it does this, a couple of shots will blow it!