Each screen has four depth levels and these are darker in colour the further underground they are.
The deeper underground an enemy is when it's killed, the more points are awarded. A partially inflated monster will gradually deflate and recover after a few seconds but while deflating, Dig Dug can pass safely through it. Fygar can only breathe fire horizontally but his flames can penetrate solid dirt. They will kill Dig Dug on contact and 'Fygar' can also kill Dig Dug by breathing fire on him. The monsters move faster than Dig Dug in vertical tunnels and slower on the surface. They can float through solid dirt and travel diagonally but once a ghost enters a tunnel, it can be killed. In this form they can't be killed are aren't restricted to using tunnels to move around.
Monsters are initially trapped in caves and can escape in one of two ways: Dig Dug can dig them out, after which they will immediately start chasing the player, but after the set time monsters can also escape a cave by turning into ghosts.
There are two kinds of enemies in the game 'Pookas' (a race of round, red monsters) and 'Fygars' (a race of green, fire-breathing dragons). This is achieved by either inflating them with an air pump until they explode, or by dropping rocks onto them. Dig Dug is single screen action game in which the player must dig horizontal and vertical tunnels to reach and eliminate the underground-dwelling monsters living there.
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