All my base are belong to Dave!
The absolute best item finding/puzzle solving adventure game I have ever played!
SPOILER ALERT: FINAL BOSS
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1st form: Just climb the stairs and press the button, he should be zapped until he is "slain"
2nd form: Stay in the little alcove where his blasts can't hit you and DON"T MOVE! Soon he will exclaim that his powers are weakining, continue not moving and sooner or later he will die.
Jump on the cloud and you just finished the game!