Grimrock: Combo Lock

-- first is lever id, second is chars to iterate through
-- add more {lever, chars} items if necessary
levers = {  {"puzzle_lever_100", "0123456789"},
        {"puzzle_lever_10", "0123456789"},
        {"puzzle_lever_1", "0123456789"}    }

-- insert solution here
solution = "420"

-- insert door here
door = "puzzle_door"

counters = {}
entity = 1 chars = 2

for k = 1, #levers do
    levers[k][entity] = findEntity(levers[k][entity])
    levers[k][entity]:addConnector("any", self.id, "isPulled")
    counters[k] = 0
end

function isPulled(lever)
    local correct = 0
    local string = ""
    for k = 1, #levers do
        if lever.id == levers[k][entity].id then
            counters[k] = counters[k] + 1
            if counters[k] == #levers[k][chars] then counters[k] = 0 end
        end
        local char = levers[k][chars]:sub(counters[k] + 1, counters[k] + 1)
        string = string .. char
        if char == solution:sub(k, k) then correct = correct + 1 end
    end
    hudPrint(string)
    if correct == #levers then findEntity(door):open() end
end