Sony is kicking off its annual "Spring Fever" promotion on PlayStation Network today, and this year it has decided to shine the spotlight on indie games. For the next four weeks, a new indie game will drop each week. All of them will feature cross-buy functionality, and discounts for Plus members.

It starts this week with Guacamelee, then continues next week with Dragon Fantasy Book 1, then Thomas Was Alone, and finally Zombie Tycoon 2. The first three will launch at a 20% discount for Plus members ($11.99, $7.99, and $7.99, respectively), while Zombie Tycoon will be free.

The Spring Fever sale will also feature discounts on various franchises. For example, Borderlands will come first this week, followed by Grand Theft Auto, Resident Evil, and PlayStation All-Stars Battle Royale. More info on the discounts can be found on the PlayStation.Blog.