The Grounded Bundle comprises a few moving parts, namely one for single-player and four for multiplayer. For solo enthusiasts, a new Grounded Mode ($5) ups the difficulty to a level Naughty Dog's been billing as Everest-like. "The AI is relentless, smart, and brutal," cackled Community Strategist Eric Monacelli, "and survival will be near impossible."
On the multiplayer side, there are four maps in the Reclaimed Territories pack ($10), five weapons in the Survivalist bundle ($6), and an assortment of skills across the Survival and Professional bundles ($4 each). For some nittier, grittier info, the PlayStation Blog goes into all the multiplayer content in clinical detail.
As ever, if you're a holder of the $20 season pass you don't have to worry about those standalone prices in brackets. If you're not a season pass holder, you may want to get in on the deal before it's discontinued in mid-May, because it also includes the Left Behind and Abandoned Territories content released earlier this year. Or, you could wait for the PS4 "Remastered" edition. It comes with Left Behind, Abandoned Territories and Reclaimed Territories, and it's due to hit sometime this summer.