Call-of-duty-ghosts

: Save all your flashbangs and frag grenades specifically for this room.

: If you see any red on your screen indicating damage, you must restart from the last checkpoint to try again. Other Notable Achievements call-of-duty-ghosts

If you are looking for other "pieces" of the game's completion requirements, you might also be interested in: : Save all your flashbangs and frag grenades

: Earned in Mission 6: "Legends Never Die" by killing 6 enemies with a knife while underwater. Call of Duty Ghosts: Piece of Cake Trophy/Achievement - HTG Call of Duty Ghosts: Piece of Cake Trophy/Achievement

The phrase "provide an piece" regarding most likely refers to the "Piece of Cake" achievement/trophy, which is earned by completing a specific objective during the campaign . "Piece of Cake" Achievement Guide

: Immediately after breaching the common room door with your squad. Strategy :

: Your teammates are invincible; let them push forward and finish off any stragglers while you stay safely behind.