[Update: It looks like Second Encounter is 80 percent off, which is not what we were originally told, but... cool! You can grab it for $3.99. Thanks to BrandonUndead for the heads up.]
Croatia-based Croteam isn't celebrating the fourth of July I'm sure, but it's discounting its Serious Sam games for the holidays nonetheless. Go America!
All Serious Sam titles are 66% off on Steam today, which means you can get games like Serious Sam HD: The Second Encounter for a mere $6.79. Croteam is going even crazier with Serious Sam HD… it's 80 percent off. That's like free plus Serious Sam "awesome tax" or something.
Today will also be the day that the Serious Sam HD: Second Encounter Steam "Summer Camp" activities will be revealed. Completing the activity (which hasn't been revealed at the time of this writing) will net you one of eight new multiplayer character models, including Silver Sarah and Cobalt Cinderella. Choose wisely.