I added Hidden lab area and three zombie heads that when shot all of them open the area up.

The Back garden has now been added into the playable area

All bugs that where found have been resolved.

[BUGS]

1 - Prone under stairs, zombies pile up on top of stairs

2 - When quick revive goes away the zombies won't go into that room

3 - Pack a punch can be brought through door by crouching