These small mines will cause damage to the player upon contact. They can
be found in the air as well as on the ground. Sometimes they even move.
Doors block entrances to rooms. Two varieties of doors exist: sensor
activated doors and switch activated doors.
Force fields are walls of energy which prevent the user from moving
through them. Force fields may be as high as one screen.
Secret areas are hidden behind these tiles. Hidden tiles look like
ordinary tiles except that they will break up when dealt enough damage.
When the tiles have been destroyed completely they will explode and cause
damage to any near-by aliens.
Use these to climb up and down to different levels.
Lava tiles will do constant damage to a player while they are in contact
with the lava.
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