Recently, I soloed my way through an adventure that was included in MOADESTAR WIP (34 pages, free/pay what you want at DriveThruRPG). It is a fun adventure for Critical 10: Play Test Version (46 pages, same price and place). To create my solo engine, I changed four lines in The Anime Hack (46 pages, same place). I created six characters. They work for MIB and can be teleported to different multiverses and back in time. Their first mission sent them to a medieval world. They were never given a good reason why for this particular mission, but they did get some details in the briefing.

The adventure started them off in a grassy field. They were dressed in the clothing and armor of the time except for Katina. She insisted on wearing her steampunk cosplay outfit. They saw some smoke off in the distance, so that is where they went. This brought them to the village of Treymon. They talked to the guard and had to pay to get in. Inside the walled village, they received more details about the goblin raids on caravans. After this, it was getting late so they spent the night in the village. In the morning they went to the site of the ambushes and found some clues. The PC Combs set up a trap and then they waited for the goblins. After it got dark, they heard the sound of the trap going off. It had captured a goblin which was hanging by his ankle. The battle started. The PCs killed thirteen goblins, but Katina went down. Combs used his smoke grenade and the PCs escaped with Katina. They spent the night at the village so that they could recover from their wounds.

On Day 3, they went back to the battle site and then followed the goblin trail back to the goblin cave. Ragnar killed five goblins with his grenade. The goblins retreated further back into their cave. Katina set up her C4 at the cave entrance. When a goblin went to check it out, she blew him up. At this point, the only goblins left alive in the cave were females and children. The PCs explained to them why the battle happened. They had to communicate with gestures and dirt diagrams. The PCs then went back to the village. Prad the PC explained to the villagers what had happened and then got them involved in a game of cards. As he was getting ready to collect his earnings (copper pieces), the PCs were teleported out. Prad was not happy.

Give this a try!