【玩法设计】迷宫传送门解谜：门扉机关的解谜规则设计

local ORDER = {}
local function genOrder()
    local nums = { 1, 2, 3, 4 }
    for i = #nums, 2, -1 do
        local j = math.random(1, i)
        nums[i], nums[j] = nums[j], nums[i]
    end
    for pos, id in ipairs(nums) do
        ORDER[id] = pos
    end
end

local step = {}
function stepOnStone(actor, stoneId)
    local player = class(actor)
    local expect = #step + 1
    if ORDER[stoneId] == expect then
        step[#step + 1] = stoneId
        sendmsg(actor, 0, "石碑亮起（" .. #step .. "/4）")
        if #step == 4 then
            sendcentermsg("封印解除，传送门开启了！")
        end
    else
        stepErr = (stepErr or 0) + 1
        step = {}
        sendmsg(actor, 0, "石碑暗了下去，顺序似乎不对……")
        if stepErr >= 3 then
            sendmsg(actor, 0, "线索提示：碑文首字连起来是口诀")
        end
    end
end