Botting or automated programs in Massively
Multiplayer Online Games (MMOGs) has long been a problem
in these networked virtual environments. The use of bots gives
cheating players an unfair advantage over other honest
players. Using bots, players can potentially amass a huge
amount of game wealth, resources, experience points, etc.
without much effort, as bot programs can be run continuously
for countless hours and will never get tired. Honest players on
the other hand have to spend much more time and effort in
order to gather an equal amount of game resources. This
destroys the fun for legitimate players, ruins the balance of the
game and threatens the game developer’s revenue base as
discontented players may stop playing the game. Research
efforts have proposed the incorporation of CAPTCHA
(Completely Automated Public Turing test to tell Computers
and Humans Apart) challenges in games to prevent or detect
potential cheaters, by presenting challenges that are easy for a
human to solve but are difficult for a computer to solve.
However, the incorporation of CAPTCHA challenges in games
is often seen in a negative light, as they are deemed to be
intrusive and that they destroy the sense of immersion in the
game. This research presents an approach of using
CAPTCHAs in MMOGs that is both secure and adds
gameplay value to the game.