Depending on what you have or haven't played, there are loads of possibilities available on the PlayStation Store to choose from. Here is a following list of some recommendations from what's digitally available (assuming that's what you're asking about):
The Ico and Shadow of the Colossus Collection
God of War series
PixelJunk Shooter series
Super Stardust HD
Warhammer 40,000: Space Marine
Plants vs. Zombies
Red Dead Redemption
Ni no Kuni: Wrath of the White Witch
The latest Tomb Raider also released not too long ago. It might be a good idea to give that one a buy, considering the fabulous scores the game's been getting.
Sleeping Dogs or dead space 1 & 2 or older cod games. Y would u buy a $50 card and not know what to buy?
i didnt it once. i still have money on account for whatever i might want to buy. helpful for dlcs or random sales.
OT: try okami hd ($20) or tomb raider ($60)
tomb raider is amazing. i just beat it yesterday. its better than uncharted!
what sould i buy hmm
Sounding off on the OP, I have received a $50 PSN code for free... calm down, lower your pitch forks. It was because I have the PlayStation credit card..
Anyway, should I get myself another 12 month PS+ ( I already bought it at the begining of March) or just buy a bunch of games? I already spent the $50 necessary for this month.. If I spend another 50 I get $20! Woohoo!