Dandy
HIDDEN MESSAGE: Level K is comprised of the words Up and Down (picture #1). {Scott Stilphen}
HIDDEN MESSAGE: Level N is comprised of a cryptic message of sorts (picture #2). NHII stands for New House II, the dormitory at MIT where programmer John Howard Palevich stayed. JG stands for Joel Gluck, who Palevich thanked for his suggestions in the manual. MT and HA are possibly the initials for other students. {Scott Stilphen}
HIDDEN MESSAGE: Level P is comprised of the message Hackerjack Palevich, a nickname perhaps for programmer John Howard Palevich (picture #3). {Scott Stilphen}
HIDDEN MESSAGE: Level W is comprised of what appears to be a map (picture #4). {Scott Stilphen}
HIDDEN MESSAGE: Level Y is comprised of the message The End!! {Scott Stilphen}
HIDDEN MESSAGE: Level Z is comprised of the message HEAVEN. The same level keeps repeating. {Scott Stilphen}
Level Q is comprised of question marks ?.