Where to put more complex conditions? 

"LOOK" --> Null.look()? Room.look? 

"EXAMINE SWORD" --> Object.examine()? Darkness.examine()?
(when room is dark) 

"PUT MEAT IN BASKET" --> Meat.put(Basket)? Basket.put(Meat)? 

"TAKE PIE" --> Orc.takeNearby(Pie)? 
(when angry orc is in room) 

"PULL LEVER" --> Lever.anyTouching()? 
(when lever is electrified)