Depth Dwellers

* During the game press
[Ctrl]+[Alt]+[I] : God mode
[Ctrl]+[Alt]+[L] : Extra live
[Ctrl]+[Alt]+[F] : All weapons
[Ctrl]+[Alt]+[N] : Warp to the next level

* Level One Secret Location
Upon discovering the first of the wandering blokes, you will see
a wall panel with green slime oozing out. Behind that you'll
find some bonus items. (Information from Cheat Machine)