(spoilers ahead, don't read if you don't want to know)
well, the keypad to the front door is a little silly... how would the guy who's painting the room know your Bomb game high score in order to program it to the door? :P
(spoilers behind, don't read if you don't want to know)
for all of you that don't know how to use google and are stuck:
http://jayisgames.com/archives/2007/03/gateway_2.php#walkthrough
there's a walkthrough at the bottom.
 "Escape the Paint!"){kind=icon}
 "Gateway II"){kind=icon}
 "TETRIS Achievements"){kind=icon}
 "The Torture Game 2"){kind=icon}
 "Understanding Games: Episode 1"){kind=tracking}
 "You Have To Burn The Rope"){kind=icon}