You have to buy every season separately, but not every episode (actually, the Telltale Store does not allow the purchase of individual episodes).
Each season of a Telltale game has between 3 and 6 episodes (3 for Hector, 6 for the first season of Sam & Max, 4 or 5 for the other games). You can check out the number of episodes per season for any Telltale game on the Games page.
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You have to buy every season separately, but not every episode (actually, the Telltale Store does not allow the purchase of individual episodes).
Each season of a Telltale game has between 3 and 6 episodes (3 for Hector, 6 for the first season of Sam & Max, 4 or 5 for the other games). You can check out the number of episodes per season for any Telltale game on the Games page.