Napa posted one that does.
Here's another one. TO change the time between guesses change the 10 in set -u10 %guessact 1

ON *:TEXT:!number:#: {
  if (!%number [ $+ [ $chan ] ]) {
    set %number [ $+ [ $chan ] ] $rand(1,999) 
    msg $chan I Have Chosen A Random Number Between: 1 And 999 To Guess What It Is Type: !guess <number> 
  } 
}
ON *:TEXT:!guess*:#: {
  if (%number [ $+ [ $chan ] ]) && ($2 isnum 1-999) && (!%guessact) {
    set -u10 %guessact 1
    inc %guesses
    if ($2 == %number [ $+ [ $chan ] ]) { msg # WOW nice job!! $nick The Number Was $2 $+ ! It took %guesses guesses. | unset %number [ $+ [ $chan ] ] | unset %scriptcount }
    elseif ($2 < %number [ $+ [ $chan ] ]) { msg # It's Higher Than $2 } 
    elseif ($2 > %number [ $+ [ $chan ] ]) { msg # It's Lower Than $2 } 
    else { echo Script Error! } 
  }
}