Metal Gear Online Cheats & Tips

Type <song> to make your character sing.
Other players will hear your character singing.</song>

You can use the colored smoke grenades to alter your character's voice. Toss a smoke grenade, and make your character cough by it. The red smoke deepens it and slows it down somewhat. The green smoke restores it back to normal. The yellow smoke raises the pitch. White smoke has no affect and will not reset it. This effect does not wear off until you die or a new round starts.

The multifunctioning cardboard box can do:

Avoid the flash of a stun gernade

Avoid magazines

Regain stamina

Hide (This is an advantage because there are other boxes randomly scattered around the map, so people don't know which box is manned or unmanned)

The Cardboard Box also puts out fires.