They came to your home in the early hours and whisked you away.
The four by four's windows were completely blacked out but the agents seemed amicable enough, albeit fairly taciturn.
After a while you felt like you would have started to doze had it been an ordinary journey you were making at this hour. At some point you went off road; a short time after you heard the sound of the tyres crunching against gravel and then the sound of an automated door opening then closing; you had arrived.
You were in a large, spotless garage. "Welcome to Base 62, I am I, yes yes I know, pot-luck I can assure you. You are here because you have been selected as a candidate for enlistment; only a very select few see inside these walls", said the immaculately attired middle aged gentleman who met you as the door was opened. "Coffee, tea, orange juice? A croissant or two to apologise for the early start? We like to allow a whole day to allow you to really get your teeth into our entrance test. Follow me and we can get you started".
You are taken to what looks like a normal meeting room - a spread of breakfast delights, juices, hot coffee and tea are all at the ready, and a computer is set up at a desk. "Help yourself to the food and drink, if there is anything else just let S know by poking your head out the door. As soon as you are ready we have set you some maze-based problems to solve, just click a key to wake the computer. They will get harder and may require some of your computing skills, although we never underestimate the ingenuity of the human mind here at Base 62. Let S know when you are done or if you want to leave at any time".
And with that he's gone. You grab a cinnamon Danish*, head to the computer and click a key, intrigued...
* replace with your favourite.