Chex Quest Advanced is a project by Arch129 and The Slimeinator to improve the original Chex Quest much like The Ultimate Chex Quest, but Chex Quest Advanced is 100% compatible with the original CHEX.EXE engine. One new thing is that the Flemoidus Cycloptis Ultricus and Flem Mine appear in the first episode (E1M1 - E1M5). All the original levels have been edited in some way.