By using the console in most source ports (e.g. GZDoom) you can find levels of The Ultimate Doom from E1M6 up, albeit Chex Quest-tised. Some enemies such as the Cyberdemon cannot be seen because Digital Café did not include that enemy in Chex Quest, therefore no sprite is included for it. Intermissions and endings for episodes 2, 3, and 4 are the same as the originals, though.
If you complete E2M5, E3M5 and E4M5, you will see the otherwise inaccessible ending strings "You've done it!", "Wonderful job!" and "Fantastic!". Completing E3M5 will also show the original endgame sequence from Doom, showing a rabbit in a green field then cutting to a cityscape with the rabbit's head on a pike. The original Robert Prince music track "Sweet Little Dead Bunny" from the original Doom is still included in the IWAD, though.
These levels were removed when Chex Quest 3 was released in 2008.
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