This Solipsist RPG scenario starts with the PCs being part of a group of Solipsists in New York City. Think of the group as a dysfunctional support group. Solipsists have their own stresses, and would naturally seek the company of others with those same stresses. They're all such egotists, though, that they don't do much supporting.

One member of this particular group, H.G., is a UFO nut. Her vision is to help usher the Earth into full membership in the Galactic League, with alien technology brining an end to war, suffering, and death. H.G. had been frustrated with her attempts to bring this about in consensus reality, because of the interference of Solipsists whose visions conflicted with her own.

So she decided to bring it about in such a dramatic way that either nobody could change it, or she would push herself to the point of ascending into her own world. Either way, she'd have what she wanted.

The PCs when I ran this were a Buddhist monk whose vision was of world peace and inner harmony, a college dropout who thought Plato had it right all along and styled himself the Philosopher King, and an architect who was obsessed with 14th century cathedral architecture.

They all went down to Central Park to see what H.G. would do. She manifested an alien control panel out of a boulder, and began to work on it. Dark clouds blew in and the wind began to blow ever more violently. The Buddhist monk tried to calm the winds down, without success. The Philosopher King decided that the rational explanation was that a storm was brewing, and tried to make it rain, without success. The Philosopher King changed tactics, and pulled five off-duty policemen out of the crowd to appoint as his auxiliaries, and started them into managing the crowd for an orderly movement toward shelter.

H.G. had finally pushed herself enough to ascend, stabbed a final button on the control console, and moved into her own world where aliens did land, and she negotiated Earth's entry into the Galactic League. In consensus reality, a meteorite crushed her. That meteorite was followed by a rain of them all over the city. The Buddhist Monk changed reality to ensure that any of them that might hit the city would burn up in the atmosphere, providing a nice fireworks display. People began to talk about it bring a miracle that none of the meteorites hit the city, which offended the Philosopher King. So he changed reality so that there was a rational explanation, that being all major cities created their own magnetic field capable of deflecting meteorites (this was their first major change that affected the entire world...from now on, every major city could not be hit by a meteorite due to its built in magnetic field).

The Philosopher King was notified by one of his auxiliaries, though, that other meteorites had landed, and in particular they were getting strange reports out of Trenton, New Jersey. The three Solipsists hailed a cab and went to Trenton. Along the way, the architect changed the side windows of the cab to stained glass to eliminate the site of the architecture along the road.

In a field near Trenton, they found a large boulder, still steaming from its passage through the atmosphere, with a small hole in the top. The three Solipsists went to investigate, at which a small device on a flexible metal arm extended from the hole. As it was about to fire on the Solipsists, the Buddhist monk changed reality to make it non-violent. This change overshot, so not only was the device non-violent, but the National Guard troopers guarding the site all dropped their guns and went home.

The boulder began unscrewing its top half, preparatory to a Martian war machine emerging. The architect changed reality so that the boulder tipped backward into a small hole that prevented it from unscrewing. Yet they could still hear reports from the radios the National Guardsmen had left behind that boulders in other fields were still unscrewing and war machines emerging there. The Buddhist monk changed reality so that instead of violent war machines emerging, the boulders were actually spewing flowers into the air in celebration of Flower Day. The architect cooperated on this one, and the flower spewing device was actually a beautiful example of 14th century architecture.

Not liking the murmurs of miracles from the crowd, the Philosopher King tried to change reality to put a "Made in Japan" sticker on the device, but couldn't make enough headway against the architect's vision. So instead he changed the opinions of the onlookers, so that they decided it must be a publicity gimmick of Tiffany's.

Changing all the boulders to flower spewing devices eliminated one of the Shadow's threads. The next thread took them back to Central Park, where an alien ship had landed and the mayor was talking to the aliens. The Philosopher King changed reality so that he was in charge, and the mayor allowed him to take over negotiations.

The aliens' message was simple. They wanted to use the technology of the Galactic League to eliminate war, suffering, and disease. The Philosopher King was not in favor of this, and tried to make several changes showing the aliens to be evil, but was stymied by the Buddhist Monk being totally in favor of the aliens' message. At one point the Philosopher King got hold of the aliens' manual for helping Earth, titled "How To Serve Man". The player decided his character had seen that episode, and changed reality to convince a few people that the aliens were here to eat us.

Overall, though, the other Solipsists were still in favor of the aliens' message of peace and an end to suffering. Finally, the architect changed reality to allow himself to understand the alien language, and discovered that the book was in fact a cookbook.

In an about face, the Buddhist Monk was now trying to change reality for a peaceful resolution with the aliens, while the Philosopher King had decided that if you can't beat them, join them. So he started negotiating that the aliens could run the nursing homes and eat all the old people they wanted. Eventually the Buddhist Monk succeeded in a reality change that caused the aliens to realize that eating animals was horribly wrong, and in guilt they fled the Earth.

This resolved the second thread the Shadow had planned. Thinking it was all over, the Philosopher King changed reality to give himself a Greenwich Village HQ, planning on convincing everyone there to get real jobs to contribute productively to society. The architect cooperated in this, so the HQ ended up being a beautiful example of 14th century architecture.

At this point the Shadow emerged, wearing the body of H.G. The Philosopher King tried a change that would convert the Shadow into a happy street sweeper. Some bidding went on, and eventually the Shadow outbid the Philosopher King and the change that happened was that the King himself became the street sweeper, learning of the joys of manual labor (much to his horror). The other Solipsists didn't cooperate with the Philosopher King's change, because they liked the idea of his becoming a street sweeper.

After several other changes failed to thwart the Shadow, they'd finally weakened it enough that all three Solipsists cooperating could defeat it. The Shadow was driven out of the world, and H.G. became a street sweeper at the Philosopher King's Greenwich Village HQ.

The main trick in GMing Solipsist is to be ready to roll with whatever changes the PCs make. You may have intended for the war machines to lay waste to New York, but you can't plan that far ahead in this game. Create the major theme of the Shadow incursion, come up with some likely threads, and just go with the flow.