The Humble Monthly subscription plan delivers you a selection of new games (to keep!) every month, gives you 10% off everything in the Humble Store, and donates 5% of each month’s proceeds to charity, but if all that wasn’t enough to get you to sign up, how about a free copy of X-COM UFO Defense?

For a limited time, if you’re already part of Humble, or if you sign up for any subscription plan, you’ll get immediate access to the game and it’s yours to keep even if you cancel your membership. Month-to-month subscriptions cost $12, and can be cancelled any time, but you can save more if you pre-pay for longer periods.

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Also, as an added bonus, you’ll be able to get XCOM 2, one of the best strategy games out right now, for free as well.