Thanks Ron for brighten my childhood with monkey, maniac and indy!!!! I want to tell you a secret about Maniac, after so long as I stuck with eleven years old, my mind thought a great idea to spend the game. I'm going to tell you how i finished the game.
I had save the game in front of a door (anyone) closed, and i had save another game in front of the same door but now open, i was compare 2 files with hex editor and.... only 1 different!!! i discovered the bytes that means: "closed doors" and "open doors" so, i change all closed to open and.... when loads the game, all doors open! so i go to the jail, go into the open lab door, and finish the game!!!! It was amazing, fapfapfapfap.  Thanks a lot again for the bests games for ever made!!