pLeitorian's Levelpacks refers to 3 levelpacks that pLeitorian made for Keen 1 in 1999 with 16 levels each, but they all use the original Keen 1 map. All of them were made using the Keen Make-Over editor, and the levels are known for being very difficult. Recurring elements throughout the levelpacks include "SDC" being written, Christian crosses formed by soda, hearts made with lollipops, and frequent use of teleporters.
- Main Article: pLeitorian's 1st Levelpack
In the first levelpack, most of the levels are 1-way scrollers (up or sideways), but 6 or 7 of them are 2-way scrollers. This is because the author experienced difficulties when trying to make large levels with Keen Make-Over. A Pogo Stick should be acquired as soon as possible, since some levels are impossible without it. It is notable for being the first Keen 1 levelpack to have 16 new levels.
- Main Article: pLeitorian's 2nd Levelpack
The levels in the second levelpack are more square compared to the first. There are a few things introduced in the levelpack that would also be used in the third levelpack, such as its unique structure, where all of the four ship parts are located in one level that must be reached via one of the several hidden teleporters.
- Main Article: pLeitorian's 3rd Levelpack
The third and final levelpack retains the same stuff used in the previous levelpack, including the structure. It is unique for having an altered storytxt that simply states:
LEVEL PAK 3 YOU KNOW THE DRILL BY NOW: FIND THE FOUR SHIP PARTS. THIS ONE IS AN ALL OUT BLOODBATH... GOOD LUCK, YOU'LL NEED IT!!