game.gravity = function(character, dt)
  if character.jump.velocity ~= 0 then
    character.jump.isJumping = true
    character.position.y = character.position.y + (character.jump.velocity * dt)
    character.jump.velocity = character.jump.velocity - (character.gravity * dt)
  end

  if character.position.y > character.jump.ground then
    character.jump.velocity = 0
    character.position.y = character.jump.ground
    character.jump.higher = character.jump.higherMax

    character.jump.limitButtonJump = false
    character.jump.isJumping = false
    character.actionA = false

    if love.keyboard.isScancodeDown(button.up) then
      character.actionUp = true
    elseif love.keyboard.isScancodeDown(button.down) then
      character.actionDown = true
    end
  end
end