Hey Knightowl,
Yea click means L.Click, I realized these cheets dont translate as well when you play with the mouse and keyboard so here is an easier way
Mouse and Keyboard Cheats
Just press all three keys at the same time:
Invulnerability: I N L
Big Bullets: B Y G
Big Head Mode: B I G
Max Resources: R S C
Max Hearts: H R T
Max Ammo: G U N
Herd Up: H U P
Herd Down: H D M
Max Gas: G A S
All Survivors: S U V
All Shards: O R B
Hope this helps,
Rafi