To complete the level you have to collect all emeralds or to kill all monsters on the level.
Game controls:
Player 1: Move Digger: Arrow keys Fire: Enter Player 2 (in simultaneous mode): Move Digger: F, C, V, B Fire: 1 Other keys: F10 - Exit
Player 1:
Move Digger: Arrow keys Fire: Enter
Player 2 (in simultaneous mode):
Move Digger: F, C, V, B Fire: 1
Other keys:
F10 - Exit