return function(mod)
  local blocks = {}
  for i = 1, 30 do blocks[i] = 10 end
  blocks[8], blocks[9] = 11, 11
  local pallet = mod.content.maps:get("PALLET_TOWN")
  local palletBlocks = {}
  for i, block in ipairs(pallet.blocks) do palletBlocks[i] = block end
  palletBlocks[7 * pallet.width] = 10

  mod.content.maps:register("TUTORIAL_ROUTE", {
    id = "TUTORIAL_ROUTE", label = "TutorialRoute", index = 1000,
    tileset = "OVERWORLD", width = 6, height = 5, blocks = blocks,
    borderBlock = 10, connections = { west = { map = "PALLET_TOWN", offset = -2 } },
    objects = {
      {
        index = 91, x = 4, y = 2, sprite = "SPRITE_POKE_BALL",
        movement = "STAY", range = "NONE", item = "NUGGET",
        text = "TEXT_TUTORIAL_NUGGET", name = "TUTORIAL_ROUTE_NUGGET",
      },
    },
  })
  mod.content.maps:patch("PALLET_TOWN", {
    connections = { east = { map = "TUTORIAL_ROUTE", offset = 2 } },
    blocks = palletBlocks,
    objects = { __append = {
      {
        index = 90, x = 8, y = 7, sprite = "SPRITE_BEAUTY",
        movement = "STAY", range = "NONE", text = "TEXT_TUTORIAL_WORLD",
        name = "TUTORIAL_WORLD_NPC",
      },
      {
        index = 92, x = 12, y = 8, sprite = "SPRITE_SCIENTIST",
        movement = "STAY", range = "NONE", text = "TEXT_TUTORIAL_QUEST",
        name = "TUTORIAL_QUEST_GIVER",
      },
    } },
  })
  mod.content.encounters:register("TUTORIAL_ROUTE", {
    grass = { rate = 25, slots = {
      { species = "PIDGEY", level = 3 }, { species = "RATTATA", level = 3 },
      { species = "PIDGEY", level = 4 }, { species = "RATTATA", level = 4 },
      { species = "PIDGEY", level = 5 }, { species = "RATTATA", level = 5 },
      { species = "PIDGEY", level = 3 }, { species = "RATTATA", level = 3 },
      { species = "PIDGEY", level = 6 }, { species = "RATTATA", level = 6 },
    } },
  })
  mod.content.map_scripts:register("PALLET_TOWN", {
    talk = {
      TEXT_TUTORIAL_WORLD = {
        { "face_player" }, { "show_text", "Welcome to the\nTutorial World!" },
      },
      TEXT_TUTORIAL_QUEST = {
        { "push_screen", "TutorialQuestLog" },
        { "check_flag", "mod:done" }, { "jump_if_true", "thanks" },
        { "check_flag", "mod:stage" }, { "jump_if_true", "pending" },
        { "set_field", "mod:stage", true },
        { "show_text", "Please bring me\na NUGGET." }, { "jump", "end" },
        { "label", "pending" }, { "check_item", "NUGGET" },
        { "jump_if_false", "wait" }, { "take_item", "NUGGET", 1 },
        { "set_field", "mod:done", true }, { "show_text", "Quest complete!" },
        { "jump", "end" }, { "label", "wait" },
        { "show_text", "The NUGGET is on\nTUTORIAL ROUTE." }, { "jump", "end" },
        { "label", "thanks" }, { "show_text", "Thanks again!" },
        { "label", "end" },
      },
    },
  })

  mod.content.screens:register("TutorialQuestLog", {
    new = function(game)
      local Font = mod.ui.Font
      local state = { isOpaque = true }
      function state:update()
        if game.input:wasPressed("b") then game.stack:pop() end
      end
      function state:draw()
        Font.drawBox(0, 0, 20, 18)
        Font.draw("QUEST LOG", 16, 16)
        local status
        if mod.save:get("done", false) then
          status = "NUGGET QUEST: DONE"
        elseif mod.save:get("stage", false) then
          status = "NUGGET QUEST: ACTIVE"
        else
          status = "NUGGET QUEST: NOT STARTED"
        end
        Font.draw(status, 16, 40)
        Font.draw("PRESS B TO EXIT", 16, 128)
      end
      return state
    end,
  })
  mod.hooks:wrap("ui.start_menu.items", function(next, game, items)
    local out = next(game, items)
    if type(out) ~= "table" then return out end
    return mod.ui.insertBefore(out, "OPTION", {
      label = "QUESTS",
      onSelect = function() mod.ui.push(game, "TutorialQuestLog") end,
    })
  end)
end