codeBreak

--This is working sort of. the code seems to always be ccce, never anything else
--and when guessing the code it only displays as CCCC

term.clear()
print("*** Code Breaker Game ***")
print("How to play: ")
print("Code is four letters a to f (all lowercase)")
print("A correct letter is marked by O")
print("An Incorrect letter is masked by X")
print("Select difficulty")
print("1-Normal")
print('2-Hard')
while true do
  local d = read()
  if d == "1" then
    trials = 6
    break
  end
  if d == "2" then
   trials = 5
   break
 end
 print('Invalid Number!')
end
length = 4
print("You have " ..trials.. " trials.")
print("")
math.randomseed( os.time() )
code = ""
for i = 1, length do
  local c = string.byte('a') + math.random(5)
  code = code .. string.char( c )
end
trial = 1

while true do
  local guess = read("Code - "..trial.."/"..trials.."?")
  mask = ""
  for i = 1, length do
    s = code:sub(i, i)
    d = guess:sub(i, i)
    if s == d then
      mask = mask .. "O"
    else
      mask = mask .. 'X'
    end
  end
  print(guess .. " -> " .. mask)
    if guess == code then
      print("You won!")
      break
    elseif trial == trials then
      print("You lose!")
      break
    end
    trial = trial + 1
end