For the last few days, I have soloed my way through a DM Dave adventure named Chittering Mines: The Lost Laboratory (20 pages). Instead of Fifth Edition, I used Champions of Odd (86 pages, a Playtest). I created four first level characters and an apprentice for each one. So, the adventure started with the PCs in a Township. They picked up the quest from the Quest Giver. Three miners had come up missing and the Township wanted them back. On the first day they explored a cavern and five rooms of the dungeon complex. They killed six sprouts, a heavyweight, a latch, and two ropers. The treasure that they found was Eyes of the Eagle. Because of PC damage, they left the dungeon and took the dwarf body that they had found with them.

They spent the night in the Township and went back to the dungeon on the second day. This time they explored six rooms. They killed a shrieker, a sprout, and a superspreader. This last monster was gross and killed one of the apprentices (Speck). At this point, they had had enough. They grabbed the other dwarf body and a Continual Flame Lantern that they had found, and headed toward the dungeon exit. Once again, they were attacked by a gross monster (a beesh). They killed it. When they got back to the Township they were given a partial cash reward for bringing back two of the three missing dwarves. Maybe you will have better luck.

Give this RPG a try!