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2v2 alien basketball · An open world

Stellar Slammers

Two-on-two arcade basketball on a low-gravity desert planet, and a whole moon to explore between games.

Download on the App Store Coming soon to the App Store
Watch the trailer

Free to play · No ads · Never pay-to-win

  • 2v2Arcade
  • 1:30Halves
  • 14Shot clock
  • 8Aliens
  • 14Courts

Teaser trailer

See it move.

An alien hangs on the rim as the ice backboard shatters on Rift Ice

Captured in the game. Footage from a pre-release build.

What it costs

  • Free

    Free to play. Download it and play every mode, court and alien.

  • No ads

    No ads in the game, and no advertising or tracking SDKs.

  • Cosmetics only

    Never pay-to-win: nothing for sale changes a rating, a shot or a match.

Low gravity.
High arc.

Every alien jumps higher here. A match is two 90-second halves with a 14-second shot clock, so every possession matters and nobody stands around.

Pick one of eight aliens, team up with a partner, and play two against two on fourteen courts across the system. Sudden-death overtime starts with another tip-off.

How it plays

Timing wins games.

  1. A tip-off on Sky Garden, the ball tossed between two jumpers
    01

    Tip-off

    Every half opens with a jump ball you time on the shot meter. Land in the green and you win most tips; the tap goes straight to your teammate.

    0.45 s from the toss to the jump

  2. 02

    The shot meter

    Hold SHOOT to jump and let go at the top. Green usually drops, yellow sometimes, red almost never, and the zones squeeze together the farther out you shoot. Hold it all the way down and it is an airball.

    6.75 m to the three-point arc

  3. 03

    Above the rim

    Dunks inside 2.9 m, flying turbo dunks from 5.8 m, layups, and alley-oops to a teammate near the rim. After the slam your alien hangs on the rim. On Rift Ice the backboard shatters and freezes back.

    10 dunks to land and collect

  4. A match on Twin Sun Temple with the scoreboard and the touch controls: stick, turbo, steal and block
    04

    Defense

    Steal, block, or hold turbo and shove. A shove puts its target on the floor about half the time, more often from the blind side or with a running start. Otherwise they stumble and keep the ball.

    14 s on the shot clock

  5. 05

    On Fire

    Score three straight baskets as a team and your duo bursts into flame: much wider shot zones, unlimited turbo, near-certain dunks from farther out, and stronger blocks and shoves.

    22 s of game clock, burning

Screenshots

Straight from the game.

Captured in the game on the iPhone layout. Pre-release build; details may change.

The roster

Eight aliens. Four ratings each.

Speed, Shooting, Dunking and Defense, each from 1 to 100. Every alien's total sits in the same band, so a rarer alien gets a wider spread, never a bigger total.

Ollo in the game's Lobby, holding a ball

Speedster

Ollo

Enthusiastic captain. Lives for the give-and-go.

Speed
72
Shooting
60
Dunking
55
Defense
38

Total 225 / 400

Compare all eight

Courts

Fourteen courts.
No two alike.

A desert mesa at dusk, an ice moon whose backboards shatter on every dunk and freeze back, a deep-sea dome, a rooftop in neon rain, an observatory under a black hole. Each has its own crowd, light and scoreboard art.

  1. Mesa, captured in the game
    01

    Mesa

    Desert · Dusk · Home court

  2. Luna Bowl, captured in the game
    02

    Luna Bowl

    Moon · Night · Cold

  3. Halo Deck, captured in the game
    03

    Halo Deck

    Space station · Clean · Bright

  4. Rift Ice, captured in the game
    04

    Rift Ice

    Ice moon · Night · Cold

  5. Sporewood, captured in the game
    05

    Sporewood

    Forest · Night · Glowing

  6. Caldera, captured in the game
    06

    Caldera

    Volcano · Dusk · Hot

  7. Geode, captured in the game
    07

    Geode

    Cavern · Crystal · Violet

  8. Twin Sun Temple, captured in the game
    08

    Twin Sun Temple

    Ruins · Golden hour · Hot

  9. Eclipse Coliseum, captured in the game
    09

    Eclipse Coliseum

    Arena · Indoor · Big night

  10. The Hive, captured in the game
    10

    The Hive

    Interior · Amber · Warm

  11. The Abyss, captured in the game
    11

    The Abyss

    Deep sea · Dome · Glowing

  12. Skyline, captured in the game
    12

    Skyline

    Megacity · Rooftop · Neon rain

  13. Event Horizon, captured in the game
    13

    Event Horizon

    Black hole · Observatory · Starlight

  14. Sky Garden, captured in the game
    14

    Sky Garden

    Floating isles · Sunrise · Blossoms

Explore Rim · The open world

A moon shaped like a basketball.

Between matches, walk the moon where the game began. Its people have worshipped basketball for thousands of years; its canyons trace the seams of a ball. In low gravity every step is half a jump.

48 min
A full day on Rim: dawn, day, dusk and night, with a buzzer at the end of every quarter.
15
Mini-games around the moon, from a diving tower to a symphony of sneaker squeaks.
Hangtime
Hold jump at the top of a leap and hang there while the world slows down.
The Plunge: flips, twists and three judges
Earn a hoverboard and a UFO
Aliens racing on hoverboards through the city at night, a hologram tower behind them
Hoverboards, earned by play
Inside Rim

Score-attack contests

Three contests.
Same draw for everyone.

Every player gets the same balls, spots and rivals, so a leaderboard score means the same thing for everybody.

  • Skyline, the rooftop court in neon rain
    Skyline

    Three-Point Contest

    Five racks, sixty seconds. The meter tightens ball by ball, and the money balls are read to a few milliseconds.

  • Three alien judges raising cards that read 10, 10, 10
    Geode

    Dunk Contest

    Five rounds against two AI rivals. Choose where you take off, flick tricks in the air, time the slam, then face three judges.

  • Sporewood, the glowing mushroom forest court
    Sporewood

    Around the Moon

    A new spot after every make, from close range to half court and full court. One miss ends the streak.

Ways to play

Something new every day.

Computer players are always labelled AI. When you play against a person, you'll know.

A dunk on Event Horizon, the observatory court under a black hole
  • 01

    Quick Match

    You and an AI partner against an AI duo, on the court you pick.

  • 02

    Ranked

    Climb from Rookie through Orbit and Supernova to Galactic. Seasons last 28 days, with a patch and an aura for how far you got.

  • 03

    Daily

    A court and a twist for the day, three challenges, and a streak that forgives a missed day now and then.

  • 04

    Weekly Cup

    The same seeded match for every player that week, ranked on a Game Center leaderboard.

  • 05

    Weekend events

    Friday to Monday, one court, one twist, double match XP.

  • 06

    With a friend

    Team up online with a friend through Game Center against an AI duo.

  • 07

    Challenge codes

    Share a code and dare a friend to beat your score on the same court, twist and rivals.

The game's Lobby: Ollo holding a ball over the moon, tonight's daily challenge, his ratings and the next match

Make it yours

Earn the look.

Every alien has its own mastery track, ten levels deep. Play to unlock auras, afterimages, ball trails, flame colours and a signature dance. Legend gold at level ten is earned, never sold.

  • Create your own alien and dress it, piece by piece.
  • Everything for sale is cosmetic. Nothing you can buy changes a rating, a shot or a match.
  • Every alien, court, mode and Rim game is open to every player.

Tip-off is coming.

Free to play, with no ads. Coming soon to iPhone and iPad. Requires iOS 26 or later.

Download on the App Store Coming soon to the App Store
Watch the trailer

Teaser trailer

Captured in the game. Footage from a pre-release build.