‘I want to reward the most dedicated players’
Usually cross-game promotions are confined to one developer or publisher’s catalog and are meant as a way to boost sales for whatever the new game is. A good and recent example is Microsoft offering all theGears of Wargames to anyone who buysGears of War 4. Realistically, those older titles won’t sell a lot of copies anymore, but it might be enough incentive to get a substantial number of people to pick up the new title. Microsoft’s surely operating at a net positive with that promotion.
However, one indie developer is inverting and subverting this model. Amplify Games is giving away its new gamePolygodto anyone who has one of several achievements inThe Binding of Isaac, a game that it is in no way affiliated with (although, it does share its roguelike roots).

Studio co-founder Dominic Obojkovits explained it by saying “I really lovedThe Binding of Isaacand I thinkPolygodwill resonate well with players that also really enjoyedThe Binding of Isaac. Because of this, I want to reward the most dedicated players with a copy ofPolygod.”
As Obojkovits said, only dedicated players will fulfill the criteria to get a free copy ofPolygod. Of the achievements Amplify chose, less than five percent of players have unlocked the most common one. Here’s the full list of achievements that could net you a free game:

The Binding of Isaacachievements
The Binding of Isaac Rebirthachievements
Those who want to cash in theirBinding of Isaacprowess for a free copy ofPolygodhave a few extra steps to complete. Add Amplify’s Steam account “Atomicdomb” and shoot a message with the name of the achievement that you’ve unlocked. Amplify will look into it and sendPolygodto those who qualify. With any luck, those people will find themselves just as enamored with it as they surely are withBinding of Isaac.
This Game Is Free If You Unlock an Achievement in Another Dev’s Game[Gamespot]







