If none of the new releases are tickling your fancy these days, perhaps a dip into the past is in order. PopCap's Plants vs Zombies: Garden Warfare 2 is available to all Xbox Live Gold members (i.e., it is "free" with an active subscription, which isn't free) until April 15.
This third person shooter features 14 different character classes with over 100 playable characters split across them (i.e., one zombie character will have different variations with some slightly different abilities). The game offers two player couch co-op, four player online co-op. and a mix of the two (combo co-op) in the Garden/Graveyard Ops (a horde mode) as well as in the different multiplayer modes where you can play against A.I. bots. It's worth noting that if you're playing with a buddy on the couch, they will need an Xbox Live Gold account in order to earn any progression or if you want to go online. You can check out our full review of the game here, and we've also got a Co-Op FAQ that goes through the in-and-outs in a little more depth.
Plants vs Zombies: Garden Warfare 2 is available for "free" with an active Xbox Live Gold subscription until April 15, 2019.