We're giving away five million Steam keys in five weeks, with Bundle Stars

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Later today a million visitors to PCGamer.com with an eligible Steam account can get a free Steam key. We're giving away five games in the next five weeks, each available for seven days before being replaced, with a million Steam keys up for grabs every time.

Zachtronics Industries' SpaceChem will be our first giveaway. We gave this excellent puzzle game a score of 89 when it was released, and you can grab yourself a copy at 4PM BST today. A different free game from Bundle Stars will follow on each subsequent Wednesday, and you can expect a lot of variety from the lineup.