This could be of interest to some. I just came across an ATC mobile game
http://www.atcgame.com/
which is quite similar (and more challenging in some aspects) to he ATC landing game on the natscareer website.
Needless to say, the game is far from the real thing (not like the ATC simulators around) but it is quite enjoyable and puts you in some challenging situations (especially if you run it at high speed). Thought I might share that here.
(BTW, I have no connection/interest whatsoever with the people making the game
, did my stage 1 in Belfast on the 1st of August and I am now waiting for the date of my stage 2)