For the Paris Olympics, it could almost be a new sport: Score points by hunting down mosaics that a mystery artist who calls himself “Invader” has cemented to walls across France’s capital, the world, and even had carried aloft to the International Space Station.

Like Banksy, the British street artist he is sometimes likened to, Invader is elusive, fiercely protective of his anonymity and operating on the margins of illegality. He comes, glues, and disappears into the night, leaving behind his signature pixelated mosaics made mostly with small ceramic and glass tiles.

Most resemble the aliens from the Space Invaders arcade game. Others are wonderfully elaborate, such as still lives of fruit or, in New York, portraits of Lou Reed and Andy Warhol. Some reference pop culture – Spiderman, Star Wars, Bugs Bunny, Ninja Turtles, pizza and the like. Some hint at deep research, including a portrait of guitarist Django Reinhardt facing the house where he lived, south of Paris in Samois-sur-Seine.

Since the first catalogued mosaic of a blue Space Invader went up on a Paris street in 1998, numbered PA-01, Invader has colonized the world. There are now more than 4,000 of his mosaics in cities and towns on all continents except Antarctica.

London, Tokyo, Los Angeles, and other cities were invaded in 1999; New York, Geneva and more in 2000; Hong Kong in 2001; Berlin, Bangkok, Melbourne. On and on.

The 4,000th mosaic was glued to a brick wall in Potosi, 4,000 metres up in the Bolivian Andes, in 2021. The European Space Agency installed Invader’s Space2 mosaic aboard the International Space Station in 2015.

“‘Anytime, Anywhere’ is the philosophy,” he says on his website.

Invader’s art is paired with an addictive “Flash Invaders” mobile-phone game that awards points to users who find and photograph the colourful and quirky pieces of pixelated art, and inspiring both residents and tourists to explore a city to accumulate points for status on the game’s leader board. The game boasts more than 360,000 players.

In Paris – by far The Invader’s most invaded location – the artist’s footprint is larger than ever as the Olympics loom (July 26-Aug. 11).

A new exhibition in a disused multi-story building has one of his pixelations painted on its roof, visible via satellite on Google Maps. With a telescope, the show’s visitors can also peer across the grey roofs of Paris to Invader’s latest milestone: his 1,500th mosaic in the Olympic host city and its suburbs.

PA-1500 was unveiled in February on an exterior chimney of the Pompidou Center, Paris’ foremost contemporary art museum. Unlike for the bulk of his works which he installs guerrilla-style without asking, Invader sought and got the museum’s permission to cement the red-and-white Space Invader-type alien into place overlooking the city.

“It’s a symbol. It’s number 1,500. It’s Paris,” said Alexandre Aumis, the iconic building’s security director. “It’s got to be here.”

Aumis is a new convert to “Flash Invaders.” “I run a lot in Paris, so I see them everywhere,” he said.

Some of those who know Invader say they’re expecting him to spring more surprises for the Olympics, perhaps installing new Games-themed mosaics.

“The invasion is the 15 million people who are going to arrive in Paris for the Olympic Games. It’s a lot. Obviously, there will be Invader fans among them,” said Fabrice Bousteau, the editor of Beaux Arts Magazine who curated Invader’s latest exhibition. “So, there will be this meeting between two cultures. He will doubtless invade the Games in a different way. I am almost certain.”

That’s thrilling for “Flash Invaders” players.

Niasha Chassain has tracked down just over 50 of the mosaics in Paris and says her children love the hunt.

“It’s a big celebration when we find one,” she said. “It forces you to look up in the street, to look around a bit, to think about turning around, to look in places that are perhaps not so attractive and discover that there are still things to see.”

But maybe not the Space Station.