Adventure Island

Island skip:
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Get to level 4 of the first island. After one of the spider 
enemies, walk and fire your weapon. When you hear a beep, walk 
forward and jump until an egg appears. Collect the egg and walk 
to the side of the screen with "Warp" to advance to the next 
island.


Subweapon Shop:
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In the first village enter the house that leads to a well, fall
down the well and turn left towards the door that usually gets 
you back up to ground level. Now position yourself on that very
door, jump in place and hold up in mid air. A secret door opens
just over/above the first door. Most subweapons are sold here. 


Select Level:
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After Higgins gets hit by the coconut at the title screen press 
Right, Left, Right, Left, A, B, A, B also reported as right, left,
a, b, a, b.


Get 99 items:
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Put in "0894" as a password for 99 of each item.