In a2b, you guide trains to their destination without colliding them with each other. Upon 100 such despatches, a level is complete. The tracks then grow to produce the next level.
You can aim for high score (despatch trains asap), efficiency (fewer collisions), both or neither. The tracks are computer generated so no two games are alike and there are 4 billion games to play with 4 billion levels each.
a2b keywords: train, trains, track, tracks, abstract, collision, collisions
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