Both Orcs Must Die! titles, Hero Academy 75 percent off this weekend

In honor of Robot Entertainment's fourth anniversary, the company announced a 75 percent off sale for select games and downloadable content this weekend.

Orcs Must Die!, Orcs Must Die! 2, Hero Academy and corresponding DLC packs are currently included in the promotion. While Orcs Must Die! is priced at $3.74, its sequel is $2.49. Hero Academy is available for $1.24. Purchases can be redeemed via Steam.

Both Orcs Must Die! titles are tower defense games. Hero Academy is turn-based and strategy focused, and players face off to destroy each other's crystals.

Robot Entertainment was founded in 2009, following Microsoft's shutdown of Ensemble Studios. Robot was previously responsible for maintaining both Halo Wars and Age of Empires 3, until Microsoft Game Studios assumed control of both.