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Looks innocent enough, doesn't it?
And that's the other reason I want to draw attention to this - it's because after starting it up again, marvelling at everything I remembered and everything I didn't, and then actually trying to complete a game of it, I realized that I... can't. And now I'm half incredibly impressed that anyone can do this and half absolutely envious of him for being able to come anywhere near it. Therefore, I wanted to issue the challenge to anyone who will listen - download it and attempt to solve it. Absolutely reams of documentation (and, helpfully, maps) are provided with the ZIP to guide you in treating the game as a logical problem on top of several other logical problems.
Snakes and Ladders (and Bees)
There are multiple tickets and doors - two of each in every environment. And the ticket that corresponds to a door that lets you escape is never found in the same environment as that door - you have to collect the ticket with someone else and pass it to another agent first. To even find the correct doors, you have to gather clues given by other pickups scattered around - radios, telephones and letters - to work out which ticket corresponds with which door. However! Two types of these pickups will lie to you, and you have to work out the clues that contradict each other to work out the type of pickup that's giving you true information. Makes no sense so far? Keep going, it gets even better.
On top of that, there's a mole among your group of four characters. Also using clues provided by the pickups I mentioned above, you have to work out who this is before you accidentally allow them to collect the correct ticket and use it on the correct door like your other characters. You can, however, capture him, because if at any point you use the wrong ticket on a door, a cage will come down and trap that character (much like what happens when you go through customs today if you look foreign). However (however), you've got to do this last, after all your other characters have escaped - because only one character has access to each environment even though you have a common inventory, so whenever a character escapes you lose the chance to collect any other vital clues or tickets from their areas. Similarly, letting someone escape before you've got a necessary ticket from their area will stop you from completing it as well.
Marginally less diabolical than the real London Underground
As you can probably imagine it was absolutely amazing for its time, if not in terms of gameplay in itself then in terms of the sheer scale of the problem that you were expected to solve. Especially in 42KB - you need more memory than that in your own head to have a hope of winning. If I ever do it, rest assured I'll make another giant post boasting about it - until then, you're welcome to try and beat me to it.
You'll need DOSBox, too - 1000 cycles seems to work quite well