return function(mod)
  mod.content.items:register("MODBERRY", {
    id = "MODBERRY", name = "MODBERRY", price = 250, tossable = true,
  })
  mod.content.items:register("MODBALL", {
    id = "MODBALL", name = "MODBALL", price = 500, ball = "MODBALL",
  })
  mod.content.balls:register("MODBALL", {
    randMax = 120, hpFactor = 10, wobbleFactor = 120,
    tossAnim = "ULTRATOSS_ANIM", flicker = true,
  })
  mod.content.text_pointers:patch("ViridianMart", {
    TEXT_VIRIDIANMART_CLERK = {
      mart = { __append = { "MODBERRY", "MODBALL" } },
    },
  })
end