Chuckles is a scrapped multiplayer level from Duke Nukem 3D. The level's designer, Richard "Levelord" Gray, later released it alongside another scrapped multiplayer map, Cigam, as a free download.
Gray also released two scrapped singleplayer maps post-launch: Sewer and Sweeney.
Overview
Chuckles is a small map filled with teleporters, each of which is paired with another teleporter directly across from it. Some of the multiplayer spawn points on the map are between two rows of 8 teleporters (16 total), essentially creating a maze of teleporters for anyone who spawns in the room.
This map is referenced in the 20th anniversary developer commentary on the secret level Faces of Death. Allen Blum, the designer of Faces of Death, explains that the teleporters on his map allow players to fire a rocket that can theoretically travel forever. Richard "Levelord" Gray, the designer of Chuckles, replies by mentioning that he once created a map with the same feature. Although he does not mention it by name, Gray is almost certainly referring to Chuckles:
I made one room—I should just resurrect it—it’s a room, it’s got like 12 teleporters, and they just shoot—you shoot one rocket—and then it just crisscrosses. And they’ll keep going until they lose their accuracy slightly, and they’ll hit a wall eventually.
Map
Video
* CHUCKLES.MAP - Chuckles (Unused Level)
Links
Download the map via the Duke Nukem Repository