It's that time of year again — time to turn up the air conditioner and avoid the heat by playing video games. Steam is doing its part with its annual summer sale, which just kicked off and will run until June 30th. The promotion includes a number of deals that change daily; right now you can grab XCOM Enemy Unknown for $8.49, Far Cry 3 for $7.49, and the enhanced version of The Witcher 2 for just $3.99. There are also flash sales that last for just eight hours and provide even more deals, like indie hit Hotline Miami for only $1.49. The ever-changing nature of the sale means that even if there's nothing that appeals to you right now, you'll want to check back often to see what goes on sale — you can even vote for upcoming deals. Check it out now on Steam.