Among the listings are co-op friendly titles LEGO Marvel Super Heroes for $19.99 on Vita, $24.99 on PS3 and $29.99 on PS4. The team-up brawler Castle Crashers is available on PS3 for $3.49, as is the puzzling ibb & obb for $4.99. If you're aiming for something more competitive, PlayStation All-Stars Battle Royale is available on PS3 for $9.99, and the Cross-Buy compatible Divekick is on PS3 and Vita for $2.49. You could always fight for court dominance in NBA 2K14 on PS3 for $39.99, too.
If you're gaming alone, don't worry! There are plenty of fish on the PlayStation Network.