The huge success of it and popularity of previous games inspired Alien to port the library for GTA 3 and Vice City, without some features, such as custom saves storing CLEO variables and scripts state.Īfter Alien's retirement, the development slowed down until Silent issued a version with some fixes.
Initially, CLEO was designed and made for San Andreas.
A special compatibility mode was introduced in CLEO 4.3 to solve this problem Complex scripts developed for CLEO 3 (most notably those ones made by Japanese modder Ryosuke839) may not work with CLEO 4.