Finding this key is optional. If you want the first ending (via train), just go inside the
train. If you want the second opne, let the train go and find the ventilation key right
where that train was before. Find something that blimks/shines!

tysm man that really helps

but what is the thing that blinks/shines

but what is the thing that blinks/shines

-It's the key!

Here's a better idea. When you kill the giant flea, the giant FLEA, GO ONTO THE TRAIN
BEFORE IT DEPARTS! When you get on there, wait. The game will be complete, without the use
of the Key!

THE VENTILATION KEY IS ON THE BOTTOM OF THE TRIAN OK .YOU HAVE TO LET THE TRAIN GO BY YOU
SO YOU CAN GET THE KEY