100 rooms? That somehow reminds me of Gogo the ghost on the C64 (Our first C64 game, got it when buying the thing as well as Park patrol). That had 100 rooms, but it was far from long time to play because you could find shortcuts and everything. I managed to complete it once wiht The final cartridge removing collisions. Still took a lot of time because there were traps leading you to screens you couldn't exit again. But you only rarely had to go back (if you could).
Oh how I long to play Gogo the ghost and park patrol again... maybe this should've gone in the games you wish... thread instead. Oh well it's slightly related to this what with the 100 rooms and such.