Untouchables Glitch in Left 4 Dead

Left 4 Dead

Untouchables Glitch

1) Have a friend to start a campaign in no mercy easy and the finale
2) have him to respond the radio tell him to wait to the radio guy finish talking when he finish tell him to invite you
3) When the gray square that says joining game appears tell him to call rescue timing is indispensable
4) Just finish the last chapter without die and you will get the achievement

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