Desert Spider (デサートスパイダー) is the first boss from the original Raiden, and also the first of the "Twin Tanks" type of boss.
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Desert Spider is a duo of railed tanks. Both tanks are identical, except for their paint job. The player first confronts the brown tank before the dark-green one comes into view. They are both equipped with four two-barreled guns which surround the rotating central cannon. They will be constantly aided by regular tanks coming from the sides.