Pantyhose Models From Mars (24 pages) is a sci-fi sourcebook for Push SRD version 101 (54 pages). This RPG system has its own solo mechanic. I soloed this with four PC characters that I created. The adventure started when the PCs heard a rumor about a warehouse where evil Venusians were doing secret, bad stuff. When they got there they had to take out three mutated human guards. In no time at all they set off a trap and were imprisoned in a room. They tried to escape, but the floor tilted and dropped them down to the level below. My Martian PC Telsa was able to psychic stun the fanged alien snake-like creature that was waiting for them. After they killed it, my Orphan PC Jax was able to Speak With Machines. A panel slid open and they escaped from that room.

Next, they encountered human warehouse workers. One of them guided the PCs to where humans were being held captive. The six were rescued. When they found the experiment failures, the PCs did not free them. They were insane and could not be trusted. At this point, a different human warehouse worker joined them. He had fish gills. Soon after this, Jax was teleported back to the room with the dead creature. The other PCs found a computer. They hacked it and gained info on the locations of two more warehouses like this one. When they found the lab, the scientist took out Gill with a paralyzation dart. Telsa took out the scientist with her ice gun and they rescued another victim.

When my group found an office, they busted the window and escaped through it. So, three of my PCs escaped the warehouse with seven people they had rescued. They did get credit for sabotaging the lab and finding the locations of two more warehouses. Unfortunately, Jax was captured and is still in there somewhere. Maybe you will have better luck.

Give this a try!