Version history for a2b shows you how often it was updated over the past months (starting Jul 30, 2004) as well as 'what is new' information for each update (if available, since this information provided by the author).
||Guide trains to their destination without colliding them with each other. Aim for high score (despatch asap) , efficiency (few collisions), both or neither. Computer generated tracks ensure 4 billion unique games with 4 billion levels each.
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