
"The mission: To pick up the bomb and arm it at one of the enemy's three military installations and blow it up. When the bomb has detonated, a new bomb spawns in a random location, and the race is on again. The first team to destroy all three objectives wins."
That is for Obliteration. What's Defuse? It's kind of a mystery still. DICE says it's an "even tighter and quicker infantry-only game mode" where players don't have any respawns at all. If you ask me, it kind of sounds like Counter-Strike's bomb defusal game type or even the Search and Destroy mode from the Call of Duty series.

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