Recently, I soloed my way through a fun funnel adventure for zero level characters called Mother’s Maze for Dungeon Crawl Classics. I used Quarrel & Fable (12 pages) as the RPG system. I used One Page Solo Engine as the solo engine. All three of these items are available at DriveThruRPG.
In this adventure, each of my four characters got to start with a survival pack. This pack contains one grenade and thirteen other useful items. The zero level characters are being tested by Mother, an old, aging computer. Each character has four other replicants, but only one is active at a time. The maze has 32 rooms, but my characters must have found the quickest way out. Char number One died inside a meat grinding pit. They did find a bracelet that comes with a hologram (think The Doctor, an Emergency Medical Hologram, or EMH for short, the fictional character from the television series Star Trek: Voyager).
The characters were then transported to the second training facility (the funnel module Slave-Drones of the Fantas-Ti-Plex). Each of the four characters then had a cybernetic device implanted into their cortex. Char number Two suffered from a drop in intelligence (an implant problem), but he is still functional. I am curious to see what happens next . . . .